HT48 & HT46 MCU UART Software Implementation Method
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1 HT48 & HT46 MCU UART Software Implementation Method HT48 & HT46 MCU UART Software Implementation Method D/NHA0004E Introduction With low power consumption and high performance, Holtek s 8-bit microcontrollers are suitable for a variety of system control product applications including office automation and various consumer products. Sometimes in some application systems, there s a need to have a serial asynchronous interface with other microcontrollers. In such cases, UART Software implementation is useful for applications requiring cost-effective method of low throughput data transmission between multiple devices, compared to any special-purpose IC hardware method. This Application Note introduces a simple implementation method of a software-simulated universal asynchronous receiver transmitter (UART). The software UART supports the basic 8-N-1 format, which is 8 data bits, no parity, and 1 stop bit. In serial data communication, data is transmitted sequentially; one bit at a time, and the transfer rate can be adjusted depending on the system frequency.
2 Operating Description HT48 & HT46 MCU UART Software Implementation Method This section describes the procedure to test the UART Software using the deseript.inc and dfseript.asm files. When testing, refer to the following steps: Basing on the actual circuitry, define the TXPIN and the RXPIN in the dfseript.inc file, separately as data transmission and reception pins. For serial data transmission, the system is initially configured to a certain baud rate by setting the baud rate constant. Baud Rate Constant = [System frequency f CLK /(baudrate 12)] 3 Or, the baud rate constant can also be based on the following table: System Frequency 4MHz 2MHz 1MHz Data Transfer Speed (bps) X X Xnot applicable After determining the baud rate constant, modify the value defined in the dfseript.inc file. The contained files dfseript.inc and dfseript.asm enhanced the transmission and reception execution functions in the original file. Execution of the two functions requires the following conditions: Transmit: before calling the 8-bit data to be transmitted, they must be placed in the emulator Receive: the 8-bit data received must be placed in the emulator Example Suppose we re given the following conditions: 1System frequency4mhz 2Serial transmission speed4800 3Use PA3 as transmitting pin 4Use PA2 as receiving pin ;File name: DFSERIPT.INC ;Author: Jason Tseng BaudRateConst EQU 66 ;can be taken from the table TXPIN EQU PA.3 RXPIN EQU PA.2 ifndef DFSERIPT_ASM
3 HT48 & HT46 MCU UART Software Implementation Method EXTERN TRANSMITNEAR EXTERN RECEIVENEAR endif ; End of DFSERIPT.INC ;File name: TEST.ASM ;Author: Jason Tseng include dfseript.asm MyData.SECTION DATA MyCode.SECTION CODE ORG 0H JMP START START SET PAC.2 ;set the receiving pin as input CLR PAC.3 MOV A, TRANSMIT_DATA ;set the transmitting pin as output ;data to be transmitted must pass ;through the accumulator ACC CALL TRANSMIT ;transmit the subroutine call CALL RECEIVE ;receive the subroutine call MOV RECEIVE_DATA, A ;receive data from the accumulator ACC END ; End of TEST.ASM System Resource Options RAM space: 4 ROM space: 49 I/O pin: 2
4 Appendix HT48 & HT46 MCU UART Software Implementation Method This Application Note provides two files: dfseript.inc (for details, refer to Appendix A) and dfseript.asm (for details, refer to Appendix B). The Software UART implemented in this Application Note supports the most common UART protocol, 8-N-1, so we assume that the data transmission flow consist of 8 bits data, no parity check and 1 stop bit. Basically, we have to expect that this will significantly consume MCU processing power and that there will be some errors or design constraints in using a software program to simulate hardware functionality. Generally speaking, the higher the system frequency and the baud rate, the smaller is the error. Basing from our experience, the best value for the baud rate constant is between 7~256. Appendix A ; File name: DFSERIPT.INC ; Author: Jason Tseng ; Objective: Set the applicable baud rate constant, TXPIN and RXPIN include ht48r30a-1.inc BaudRateConst EQU 66 TXPIN EQU PA.3 RXPIN EQU PA.2 ifndef DFSERIPT_ASM EXTERN TRANSMITNEAR EXTERN RECEIVENEAR endif ; End of DFSERIPT.INC Appendix B ; File name: DFSERIPT.ASM ; Author: Jason Tseng #define DFSERIPT_ASM #INCLUDE DFSERIPT.INC PUBLIC TRANSMIT PUBLIC RECEIVE BAUDRATE EQU BAUDRATECONST ;baud rate constant ;(in dfseript.inc, user defined) TX EQU TXPIN ;user defined TXPIN pin, TX RX EQU RXPIN ;user defined RXPIN pin, RX SDATA.SECTION DATA COUNT DB? ;serial bit counter TXREG DB? ;transmit to data register RCREG DB? ;receive from data register
5 HT48 & HT46 MCU UART Software Implementation Method DELAY DB? ;delay counter SERIAL.SECTION CODE TRANSMIT PROC ;TRANSMIT subroutine MOV TXREG,A ;transmit data to TXREG MOV A,BAUDRATE ;set the baud rate delay CLR TX ;transmit start flag bit 0 MOV A,9 ;set transmit data bit number MOV COUNT,A ; TXDELAY: ; SDZ DELAY ;baud rate delay loop JMP TXDELAY ; MOV A,BAUDRATE ;reload baud rate delay constant SDZ COUNT ;check if data transmission is finished JMP SENDBIT ;if transmission is not finish, jump to ;SENDBIT to transmit next bit JMP ENDTX ;if data transmission is finished, ;jump to ENDTX SENDBIT: RRC TXREG ;rotate right through C to get txreg ;transmitted data SNZ C ;check if there s a borrow at C JMP LOBIT ;C=0 jump to LOBIT transmit 0 SET TX ;C=1 transmit 1 JMP TXDELAY ; LOBIT: ; CLR TX ;transmit 0 JMP TXDELAY ; ENDTX: ; NOP ;no operation NOP ; SET TX ;stop transmitting bit T1: ; SDZ DELAY ;delay between each bit transmission ;period JMP T1 ; MOV A,BAUDRATE ; T2: ; SDZ DELAY ; JMP T2 ; RET ; TRANSMIT ENDP ; RECEIVE PROC ;receive subroutine SZ RX ;check start bit 0 JMP RECEIVE ;if there s no start bit, jump to ;receive MOV A,9 ;receive start bit initialization data
6 HT48 & HT46 MCU UART Software Implementation Method MOV COUNT,A ;set received bit number MOV A,BAUDRATE+1 ;set baud rate delay RXDELAY: ; SDZ DELAY ;baud rate delay JMP RXDELAY ; MOV A,BAUDRATE+1 ;reload baud rate constant SDZ COUNT ;check if finished receiving data JMP RXBIT ;if receiving is not finish, jump to ;RXBIT receive next bit data MOV A,RCREG ;if finish receiving, prepare to ;receive data RET ; RXBIT: ; SET C ;set received bit to 1 SNZ RX ;check if received bit is 1 CLR C ;if receive flag is 0, clear received ;bit to 0 RRC RCREG ;rotate through right of rcreg JMP RXDELAY ; RECEIVE ENDP ; END ;----- ; End of DFSERIPT.ASM
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