마이크로프로세서응용. ATmega128 7 Segment Driving

Transcription

1 마이크로프로세서응용 ATmega128 7 Segment Driving

2 7 Segment Pin Assignment b g a c X f X X Front Side EN1 EN2 d X e EN3 dp EN4 EN4 EN3 EN2 EN1 f d a g d b c dp

3 7 Segment Connection with AVR128 U1 PB.7 PB.6 PB.5 PB.4 f d a g d b c dp ATmega 128 PC.0 PC.1 PC.2 PC.3 PC.4 PC.5 PC.6 PC.7 R(330 Ohm) dp g f e d cb a

4 7 Segment Drive Example Code (1) 첫번째 7 세그먼트에 0~9 까지돌아가면서표시하는프로그램.include "m128def.inc".def temp = r16.def leddata = r17.def segen = r18.def segcnt = r19 rjmp RESET ;Reset Handle.ORG 0x0046; RESET: ldi temp,low(ramend) ; Load low byte address of end of RAM into register R16 out SPL,temp ; Initialize stack pointer to end of internal RAM ldi temp,high(ramend) ; Load high byte address of end of RAM into register R16 out SPH, temp ; Initialize high byte of stack pointer to end of internal RAM ldi temp, $0F ; Set lower 4 bits of port A as output out DDRA, temp ; ldi temp, $F0 ; Set upper 4 bits of port B as output out DDRB, temp ; ser temp ; out DDRC, temp ; Set Port C as outputs

5 7 Segment Drive Example Code (2) 첫번째 7 세그먼트에 0~9 까지돌아가면서표시하는프로그램 ldi leddata, $0F ; ldi segen, $10 ; Enable signal for the first character of 7 segment array out PORTB, segen ; forever : out PORTA, leddata ; com leddata ; complement leddata ; Load start address of segment data in program memory pointed by segdata ldi ZH, HIGH(2*segdata) ; Since program memory is 16 bit (2 byte) ldi ZL, LOW(2*segdata) ; we have to multiply 2 at the starting index loop10: ldi segcnt, 10 ; lpm r0, Z+ ; Get first segment data, increase the pointer out PORTC, r0 ; Put the data to port B rcall delay1s ; subi segcnt, 1 ; brne loop10 ; Check if loop count is zero or not rjmp forever

6 7 Segment Drive Example Code (3) 첫번째 7 세그먼트에 0~9 까지돌아가면서표시하는프로그램 delay1s: loop: segdata: ldi r20, 40 ldi r21, 255 ldi r22, 255 dec brne dec brne dec brne ret r22 loop r21 loop r20 loop.db $03, $9f, $25, $0d, $99, $49, $41, $1f, $01, $09

7 마이크로프로세서응용 7 ATmega128 Assembly Language Programming

8 Lab #1 : Swap Data 8 bit DATA swap : Input : value1 ($0100) = $73 value2 ($0101) = $74 Output: ($0100) = $74 ($0101) = $73 value result $73 $74 value result $74 $73

9 Lab #2 : Find Maximum Find the Maximum data in $0100, $0101, and $0102. Store the result to $0103. Input : ($0100) = $12 ($0101) = $34 ($0102) = $56 $0100 $0101 $0102 $12 $34 $56 Output: ($0103) = $ Input : ($0100) = $56 ($0101) = $34 $0100 ($0102) = $12 $0101 Output: ($0103) = $56 $0102 $0103 $12 $34 $56 $56

10 Lab #3 : Accumulate Odd number Calculate the sum = Output : Result ($0100) = $37 $0100???? $0100 $37

11 Lab #4 : Accumulate Even number (16bit) Calculate the sum = Output : Result ($0100) = $37 $0100???? $0100 $0101 $BA $13

12 Lab #5 : Find Negative number Determine the number of negative elements : Input : Length ($0100) = 03 data ($0101) = $84 ($0102) = $25 ($0103) = $96 Total ($0104) = 1($84)+0($25)+1($96) = 2 $0100 $0101 $0102 $0103 $0100 $0101 $0102 $0103 $ $84 $25 $96 03 $84 $25 $96 2

13 Lab #6 : Find the number of 1s Determine the number with most 1s: Input : Length ($0100) = 03 ( )=>2 data ($0101) = $84 ( )=>2 ($0102) = $25 ( )=>3 ($0103) = $96 ( )=>4 result ($0104) = $96 $0100 $0101 $0102 $ $84 $25 $96 $0100 $0101 $0102 $0103 $ $84 $25 $96 $96

14 8 수고하셨습니다

15 [GEC] Green Electronics company GEC09B-1 Case: Noryl,Black Pin:Tin-plated copper TYPE UNIT GEC09B-1 Min. Sound Output at 10cm db 85 Rated Voltage V 0-p 1.5 Operating Voltage V 0-p 1 2 Resonant Frequency Hz 2730 Max. Current Consumption ma 80 Coil Resistance Ω 6 1 Coil Impedance Ω 15 Operating Temperature Storage Temperature Weight g 0.7 Value applying at (rated voltage, 2730 Hz, 1/2 duty square wave) Value applying at (2730 Hz, sine wave,measuring current 60 A) DIMENSIONS : (Unit: mm) FREQUENCY RESPONSE: kklist101@hanmail.net Home page :

16 SPECIFICATION SHEET CUSTOMER: PRODUCT: ELECTROMAGNETIC TRANSDUCER MODEL NUMBER: G09B-1 [GEC] GREEN ELECTRONICS CO., LTD. TEL: FAX: ADD: POST CODE:

17 WE HERE APPLY FOR AUTHORIZATION TO SUPPLY THE ABOVE MENTIONED ON THE BASIS OF THE FOLLOWING SPECIFICATIONS. 1. SCOPE THESE SPECIFICATIONS APPLIED TO THE ABOVE MENTIONED ELECTROMAGNETIC TRANSDUCER. 2. MECHANICAL CHARACTERISTICS 2-1 EXTERNAL DIMENSION THE EXTERNAL DIMENSION, INDICATION ARE AS SHOWN IN DRAWING SHEETS. 2-2 APPEARANCE THE FINISHING SHALL NOT BE ACCOMPANIED BY REMARKABLE RUST,DISTORTION, CREAK,ETC. 2-3 TENSILE STRENGTH OF TERMINAL PINS EACH TERMINAL PIN SHALL BE NO ABNORMALITY WHEN THE EQUIPMENT IS PROPERLY FIXED AND 1kg OF LOAD IS GIVEN FOR 30 5 SECONDS IN AXIS DIRECTION OF TERMINAL. 3. ELECTRICAL CHARACTERISTICS(AT 25 ) 3-1 OPERATING VOLTAGE : 1-2V 3-2 RATED VOLTAGE : 1.5V 3-3 RESONANT FREQUENCY : 2730 Hz 3-4 RATED CURRENT : 80mA MAX. 3-5 SOUND PRESSURE LEVEL : 85dB MIN. 3-6 COIL RESISTANCE : 6 1 OHM 3-7 COIL IMPEDANCE : 15 OHM 3-8 OPERATING TEMPERATURE : STORAGE TEMPERATURE : DATE: PAGE:1/5 PRODUCT SPECIFICATION G09B-1 (ELECTROMAGNETIC TRANSDUCER) CUSTOMER: PRODUCER:

18 4. RELIABILITY TEST NO. ITEM TESTING CONDITION VARIANCE AFTER TEST 4-1 HUMIDITY 55 5,95 3%RH 96HRS 4-2 HIGH TEMP ,96HRS 4-3 LOW TEMP ,96HRS MINUTES 4-4 TEMPERATURE CYCLING ROOM TEMP ROOM TEMP. 10 MINUTES SOUND PRESSURE LEVEL INITIAL VALUE 10% 30 MINUTES 10 MINUTES 5 CYCLES 4-5 DROP TEST 3 TIMES FROM HEIGHT OF 50CM ON CONCRETE FLOOR NOTE: 1. TEST ITEM 4-4 AND 4-5 SHALL BE CONDUCTED WITH CIRCUIT STATE. 2. TEST SPECIMENS SHALL BE KEPT FOR 4 HRS,25 BEFORE MEASUREMENT. DATE: PAGE:2/5 PRODUCT SPECIFICATION G09B-1 (ELECTROMAGNETIC TRANSDUCER) CUSTOMER: PRODUCER:

19 5. ELECTRICAL CHARACTERISTICS TEST METHOD C.MIC C.CC S.A. 10 cm Q.S.C. F.C. T.S. A.V.M. A.A.M. S.R. S.A. : SPECTRUM ANALYAER F.C. : FREQUENCY COUNTER A.A.M.: AC AMPERE METER S.R. : SOUNDPROOF ROOM A.V.M.: AC VOLT. METER C.MIC : CONDENSER MIC T.S. : TEST SAMPLE Q.S.C.: OSCILLATOR DATE: PAGE:3/5 PRODUCT SPECIFICATION G09B-1 (ELECTROMAGNETIC TRANSDUCER) CUSTOMER: PRODUCER:

20 6.DIMENSION (UNIT:mm) DATE: PAGE:4/5 PRODUCT SPECIFICATION G09B-1 (ELECTROMAGNETIC TRANSDUCER) CUSTOMER: PRODUCER:

21

22

23 마이크로프로세서응용 9 ATmega128 Assembly Language Programming Character LCD Module Control

24 Outline 2 AVR LCD Module Connection We will examine several subroutines Delay n usec subroutine Delay 1usec subroutine Delay n msec subroutine Delay 1msec subroutine LCD Initialization subroutine LCD write4 subroutine LCD write_command, LCD write_data subroutines

25 Outline 3 Delay n usec subroutine Delay 1usec subroutine Delay n msec subroutine Delay 1msec subroutine LCD Initialization subroutine LCD write4 subroutine LCD write_command, LCD write_data subroutines

26 AVR LCD Connection Diagram(Port C) 4 LCD Module ATmega 128 VSS VDD VL RS R/W E D0 D1 D2 D3 D4 D5 D6 D7 A K GND +5V?V Port C0 GND Port C2 Port C4 Port C5 Port C6 Port C7 +5V GND Port C0 Port C1 Port C2 Port C3 Port C4 Port C5 Port C6 Port C7 ; LCD interface ; Port C is used for LCD Module Control.equ lcd_d7_port = PORTC ; lcd D7 connection.equ lcd_d7_bit = PORTC7.equ lcd_d7_ddr = DDRC.equ lcd_d6_port = PORTC ; lcd D6 connection.equ lcd_d6_bit = PORTC6.equ lcd_d6_ddr = DDRC.equ lcd_d5_port = PORTC; lcd D5 connection.equ lcd_d5_bit = PORTC5.equ lcd_d5_ddr = DDRC.equ lcd_d4_port = PORTC; lcd D4 connection.equ lcd_d4_bit = PORTC4.equ lcd_d4_ddr = DDRC.equ lcd_e_port = PORTC; Enable pin.equ lcd_e_bit = PORTC2.equ lcd_e_ddr = DDRC.equ lcd_rs_port = PORTC ; Register Select pin.equ lcd_rs_bit = PORTC0.equ lcd_rs_ddr = DDRC +5V?V GND

27 AVR LCD Connection Diagram(Port D) 5 LCD Module ATmega 128 VSS VDD VL RS R/W E D0 D1 D2 D3 D4 D5 D6 D7 A K GND +5V?V Port D0 GND Port D2 Port D4 Port D5 Port D6 Port D7 +5V GND Port D0 Port D1 Port D2 Port D3 Port D4 Port D5 Port D6 Port D7 ; LCD interface ; Port D is used for LCD Module Control.equ lcd_d7_port = PORTD ; lcd D7 connection.equ lcd_d7_bit = PORTD7.equ lcd_d7_ddr = DDRD.equ lcd_d6_port = PORTD ; lcd D6 connection.equ lcd_d6_bit = PORTD6.equ lcd_d6_ddr = DDRD.equ lcd_d5_port = PORTD; lcd D5 connection.equ lcd_d5_bit = PORTD5.equ lcd_d5_ddr = DDRD.equ lcd_d4_port = PORTD; lcd D4 connection.equ lcd_d4_bit = PORTD4.equ lcd_d4_ddr = DDRD.equ lcd_e_port = PORTD; Enable pin.equ lcd_e_bit = PORTD2.equ lcd_e_ddr = DDRD.equ lcd_rs_port = PORTD ; Register Select pin.equ lcd_rs_bit = PORTD0.equ lcd_rs_ddr = DDRD +5V?V GND

28 LCD Initialization Routine 6 START Wait 80 us Write LCD Entry Mode Command (CMD = 0x06) Wait 100 ms Write Function Reset Command (CMD = 0xC0) Wait 10 ms Write Function Reset Command (CMD = 0xC0) Wait 200 us Write Function Set Command (4 Bit Mode, 2 line LCD, 5x7 font) (CMD = 0x20) Write Function Set Command (2) (4 Bit Mode, 2 line LCD, 5x7 font) (CMD = 0x20) Wait 80 us Write LCD OFF Command (CMD = 0x08) Wait 80 us Write LCD CLR Command (CMD = 0x01) Wait 4 ms Wait 80 us Write LCD ONCommand (CMD = 0x0C) END

29 LCD Command Table 7 0x01 0x06 0x08/ 0x0C 0xC0 0x28

30 LCD Test Program Architecture 8 Main Program LCD_Init LCD_Write_String LCD_Write4 LCD_Command LCD_Command LCD_Write_Character LCD_Write4 LCD_Write4 LCD_Write4

31 Main Program for Simple LCD Display.include "m128def.inc".equ fclk = ; system clock frequency (for delays) ; register usage.def temp = R16 ; temporary storage ; LCD interface (should agree with the diagram above) ; make sure that the LCD RW pin is connected to GND.equ lcd_d7_port = PORTC ; lcd D7 connection.equ lcd_d7_bit = PORTC7.equ lcd_d7_ddr = DDRC.equ lcd_d6_port = PORTC ; lcd D6 connection.equ lcd_d6_bit = PORTC6.equ lcd_d6_ddr = DDRC.equ lcd_d5_port = PORTC ; lcd D5 connection.equ lcd_d5_bit = PORTC5.equ lcd_d5_ddr = DDRC.equ lcd_d4_port = PORTC ; lcd D4 connection.equ lcd_d4_bit = PORTC4.equ lcd_d4_ddr = DDRC.equ lcd_e_port = PORTC ; lcd Enable pin.equ lcd_e_bit = PORTC2.equ lcd_e_ddr = DDRC.equ lcd_rs_port = PORTC ; lcd Register Select pin.equ lcd_rs_bit = PORTC0.equ lcd_rs_ddr = DDRC

32 Main Program for Simple LCD Display (2) ; LCD module information.equ lcd_lineone = 0x00 ; start of line 1.equ lcd_linetwo = 0x40 ; start of line 2 ; LCD instructions.equ lcd_clear = 0b ; replace all characters with ASCII 'space'.equ lcd_home = 0b ; return cursor to first position on first line.equ lcd_entrymode = 0b ; shift cursor from left to right on read/write.equ lcd_displayoff = 0b ; turn display off.equ lcd_displayon = 0b ; display on, cursor off, don't blink character.equ lcd_functionreset = 0b ; reset the LCD.equ lcd_functionset4bit = 0b ; 4-bit data, 2-line display, 5 x 7 font.equ lcd_setcursor = 0b ; set cursor position.cseg.org 0x000 ; JMP RESET ;.ORG 0x0046; ;*********************************************** ;* Main Program ;*********************************************** RESET: ; initialize the stack pointer to the highest RAM address ldi temp,low(ramend) out SPL,temp ldi temp,high(ramend) out SPH,temp ldi temp, $FF ; out DDRC, temp ;

33 Main Program for Simple LCD Display (3) ; initialize the LCD controller as determined by the equates (LCD instructions) call LCD_Init ; initialize the LCD display for a 4-bit interface ; display the first line of information ldi ZH, high(version) ; point to the information that is to be displayed ldi ZL, low(version) ldi temp, lcd_lineone ; point to where the information should be displayed call lcd_write_string ; display the second line of information ldi ZH, high(author) ; point to the information that is to be displayed ldi ZL, low(author) ldi temp, lcd_linetwo ; point to where the information should be displayed call lcd_write_string ; endless loop HERE: rjmp HERE AUTHOR:.db write author info",0,0 VERSION:.db write version info",0,0

34 Subroutine : LCD Initialization ; ; Name: LCD_Init ; Purpose: LCD initialization for 4 Bit Data I/F ; Entry: No parameters ; Notes: Use time delays instead of checking ; the busy flag LCD_Init: ldi temp, 100 ; initial 100ms delay call delay_tms ; Set up the RS and E lines for the 'lcd_write_4' subroutine. ; select the Instruction Register (RS low) ; make sure E is initially low cbi lcd_rs_port, lcd_rs_bit cbi lcd_e_port, lcd_e_bit ; Reset the LCD controller. ldi temp, lcd_functionreset call lcd_write_4bit ldi temp, 10 call delay_tms ldi temp, lcd_functionreset call lcd_write_4bit ldi temp, 200 call delay_tus ldi temp, lcd_functionreset call lcd_write_4 ldi temp, 200 call delay_tus ; Preliminary Function Set instruction - used only to set the 4-bit mode. ; The number of lines or the font cannot be set at this time since ; the controller is still in the ; 8-bit mode, but the data transfer mode can be changed since this ;parameter is determined by one of the upper four bits of the instruction. ldi temp, lcd_functionset4bit ; set 4-bit mode call lcd_write_4bit ldi temp, 80 ; 80 us delay call delay_tus ; Function Set instruction ldi temp, lcd_functionset4bit ; set mode, lines, and font call lcd_write_command ldi temp, 80 ; 80 us delay call delay_tus ; Display On/Off Control instruction ldi temp, lcd_displayoff ; turn display OFF call lcd_write_command ldi temp, 80 ; 80 us delay call delay_tus ; Clear Display instruction ldi temp, lcd_clear ; clear display RAM call lcd_write_command ldi temp, 4 ; 4 ms delay call delay_tms ; Entry Mode Set instruction ldi temp, lcd_entrymode ; set desired shift ;characteristics call lcd_write_command ldi temp, 80 ; 80 us delay call delay_tus

35 Subroutine : LCD Initialization (2) ; This is the end of the LCD controller initialization as specified in the data sheet, but the display ; has been left in the OFF condition. This is a good time to turn the display back ON. ; Display On/Off Control instruction ldi temp, lcd_displayon ; turn the display ON call lcd_write_command ldi temp, 80 ; 80 us delay call delaytx1us ret

36 Subroutine : LCD_Write_4Bit.include "m128def.inc.def temp = r16.equ FCLK = ; LCD interface ; make sure that the LCD RW pin is GND.equ lcd_d7_port = PORTC ; lcd D7 connection.equ lcd_d7_bit = PORTC7.equ lcd_d7_ddr = DDRC.equ lcd_d6_port = PORTC ; lcd D6 connection.equ lcd_d6_bit = PORTC6.equ lcd_d6_ddr = DDRC.equ lcd_d5_port = PORTC; lcd D5 connection.equ lcd_d5_bit = PORTC5.equ lcd_d5_ddr = DDRC.equ lcd_d4_port = PORTC; lcd D4 connection.equ lcd_d4_bit = PORTC4.equ lcd_d4_ddr = DDRC.equ lcd_e_port = PORTC; lcd Enable pin.equ lcd_e_bit = PORTC2.equ lcd_e_ddr = DDRC.equ lcd_rs_port = PORTC ; lcd Register Select pin.equ lcd_rs_bit = PORTC0.equ lcd_rs_ddr = DDRC ; ; Name: LCD_Write_4Bit ; Purpose: send a nibble (4-bits) of information to the ; LCD module ; Entry: (temp) contains a byte of data with the ; desired 4-bits in the upper nibble ; (RS) is configured for the desired LCD register ; (E) is low ; (RW) is low LCD_Write_4Bit: ; set up D7 sbi lcd_d7_port, lcd_d7_bit ; sbrs temp, 7 ; cbi lcd_d7_port, lcd_d7_bit ; ; set up D6 sbi lcd_d6_port, lcd_d6_bit sbrs temp, 6 cbi lcd_d6_port, lcd_d6_bit ; set up D5 sbi lcd_d5_port, lcd_d5_bit sbrs temp, 5 cbi lcd_d5_port, lcd_d5_bit ; set up D4 sbi lcd_d4_port, lcd_d4_bit sbrs temp, 4 cbi lcd_d4_port, lcd_d4_bit

37 Subroutine : LCD_Write_4Bit ; write the data ; 'Address set-up time' (40 ns) sbi lcd_e_port, lcd_e_bit ; Enable pin high call delay1us ; implement 'Data set-up time' (80 ns) and 'Enable pulse width' (230 ns) cbi lcd_e_port, lcd_e_bit ; Enable pin low call delay1us ; implement 'Data hold time' (10 ns) and 'Enable cycle time' (500 ns) ret ;

38 Subroutine : LCD Write Command (4Bitx2) ; ; Name: LCD_write_command ; Purpose: send a byte of information to the LCD instruction register ; Entry: (temp) contains the data byte ; Exit: no parameters ; Notes: does not deal with RW (busy flag is not implemented) LCD_write_command: cbi lcd_rs_port, lcd_rs_bit ; select the Instruction Register (RS low) cbi lcd_e_port, lcd_e_bit ; make sure E is initially low call lcd_write_4 ; write the upper 4-bits of the instruction swap temp ; swap high and low nibbles call lcd_write_4 ; write the lower 4-bits of the instruction ret

39 Subroutine : LCD Write Character (4Bitx2) ; ; Name: lcd_write_character ; Purpose: send a byte of information to the LCD data register ; Entry: (temp) contains the data byte ; Exit: no parameters ; Notes: does not deal with RW (busy flag is not implemented) LCD_write_character: sbi lcd_rs_port, lcd_rs_bit ; select the Data Register (RS high) cbi lcd_e_port, lcd_e_bit ; make sure E is initially low call lcd_write_4 ; write the upper 4-bits of the data swap temp ; swap high and low nibbles call lcd_write_4 ; write the lower 4-bits of the data ret

40 Subroutine : LCD_write_String ; ; Name: lcd_write_string_4d ; Purpose: display a string of characters on the LCD ; Entry: ZH and ZL pointing to the start of the string ; (temp) contains the desired DDRAM address at which to start the display ; LCD_write_string: ; set up the initial DDRAM address ori temp, lcd_setcursor ; convert the plain address to a set cursor instruction call LCD_write_command ; set up the first DDRAM address ldi temp, 80 ; 80 us delay call delay_tus ; write the string of characters lcd_write_string_01: lpm temp, Z+ ; get a character cpi temp, 0 ; check for end of string breq lcd_write_string_02 ; done ; arrive here if this is a valid character call lcd_write_character ; display the character ldi temp, 80 ; 80 us delay call delay_tus rjmp lcd_write_string_01 ; not done, send another character ; arrive here when all characters in the message have been sent to the LCD module lcd_write_string_4d_02: ret

41 Subroutine : Delay_1uS.include "m128def.inc.def temp = r16 ;.CSEG.ORG 0x0000 ; JMP RESET ;*********************************************** ;* Main Program ;***********************************************.ORG 0x0046; RESET: ldi r16,low(ramend) ; out SPL,r16 ; ldi r16,high(ramend); out SPH, r16; call forever: Delay_1uS; rjmp forever ; ; ; Name: delay1us ; Purpose: provide a delay of 1 us with a 16 MHz clock ; frequency ; Entry: no parameters ; Exit: no parameters delay1us: push temp ; [2] pop temp ; [2] push temp ; [2] pop temp ; [2] ret ; [4] ; usec in 16 Mhz clock requires 16 clock cycle. Since the subroutine call consumes 4 clock cycles, only 12 cycles should be consumed in the delay subroutine.

42 Subroutine : Delay_TuS.include "m128def.inc.def temp = r16.cseg.org 0x0000 ; JMP RESET ;*********************************************** ;* Main Program ;***********************************************.ORG 0x0046; RESET: ldi r16,low(ramend) ; out SPL,r16 ; ldi r16,high(ramend); out SPH, r16; ldi temp, 10 ; call Delay_TuS; ; ; Name: Delay_Tus ; Purpose: provide a delay of (temp) x 1 us with ; a 16 MHz clock frequency ; Entry: (temp) = delay time in usec ; Exit: no parameters Delay_Tus: call delay_1us ; delay for 1 us (16) dec temp ; decrement the delay counter (1) brne Delay_Tus ; counter is not zero (2) ; arrive here when delay counter is zero ret ; (4) ; Delay_T usec does not guarantee the exact T usec. Note that additional 3 cycles are consumed in a loop. So this subroutine can not be used in measuring exact timing. forever: rjmp forever ;

43 Subroutine : Delay_1mS.include "m128def.inc.def temp = r16.equ FCLK = CSEG.ORG 0x0000 ; JMP RESET ;*********************************************** ;* Main Program ;***********************************************.ORG 0x0046; RESET: ldi r16,low(ramend) ; out SPL,r16 ; ldi r16,high(ramend); out SPH, r16; call forever: Delay_1mS; rjmp forever ; ; ; Name: Delay_1mS ; Purpose: provide a delay of 1 ms ; Entry: no parameters ; Exit: no parameters ; Notes: chews up FCLK/1000 clock cycles ; (including the 'call') Delay1mS: push YL ; [2] push YH ; [2] ldi YL, low (((FCLK/1000)-18)/4) ; [1] ldi YH, high(((fclk/1000)-18)/4) ; [1] delay1ms_01: sbiw YH:YL, 1 ; [2] brne delay1ms_01 ; [2] ; arrive here when delay counter is zero pop YH ; [2] pop YL ; [2] ret ; [4] ; FCLK/1000 means the number of cycles (clocks) in 1 msec. 18 means the cycles in a subroutine execpt the loop cycles. Note that subroutine call & return instruction need 4 cycles each.

44 Subroutine : Delay_TmS.include "m128def.inc.def temp = r16.equ FCLK = CSEG.ORG 0x0000 ; JMP RESET ;*********************************************** ;* Main Program ;***********************************************.ORG 0x0046; RESET: ldi r16,low(ramend) ; out SPL,r16 ; ldi r16,high(ramend); out SPH, r16; ; ; Name: Delay_TmS ; Purpose: provide a delay of (temp) x 1 ms ; Entry: (temp) = delay in msec ; Exit: no parameters Delay_TmS : call Delay_1mS ; delay for 1 ms dec temp ; update the delay counter brne delay_tms ; counter is not zero ret ; ldi temp, 10 ; call Delay_TmS; forever: rjmp forever ;

45 23 수고하셨습니다