ME 475 Lab2 Introduction of PIC and Programming. Instructor: Zhen Wang
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1 ME 475 Lab2 Introduction of PIC and Programming Instructor: Zhen Wang
2 Outline Lecture Introduction of PIC microcontroller Programming cycle Read CH5 Programming guidelines Read CH6 Sample program for each module 2
3 PIC microcontroller Microcomputer systems 3
4 PIC microcontroller A microcontroller is a simplified version of a similar architecture, placed on one chip 4
5 Main features Program memory and Data memory An accumulator (also called the working register, W) Separate data bus for program memory data memory. 40 pin packages 5 bidirectional I/O ports 15 interrupts 35fixed width instructions 8 A/D input channels Implemented with Parallel Slave Port 5
6 Separate data bus Harvard architecture Concurrent instruction fetching and data accessing Von Neumann architecture One operation at one time 6
7 Memory organization 8K 14 bit words of Flash program memory, 368 bytes of data RAM, 256bytes of data EEPROM 8 level x 13 bit wide hardware stack. 7
8 Data RAM Divided into 4 banks contains the General Purpose Registers (GPR) and thespecial Function Registers (SFR). 8
9 Register file map 9
10 Data RAM SFRs Control the core" operation of the microcontroller GPRs Each has accessible and unique address. 8 bit wide in memory space 10
11 Data RAM Addressing of the entire data memory directly using the absolute address of each register file (7 bit wide), or indirectly through the INDirect File (INDF) register and the File Sl Select Register (FSR) 11
12
13 Example of SFR Status Register (8 bit wide) arithmetic status of the ALU, the Reset status the bank select bits for data memory. Description of each register e is aaabe available in PIC manual. 13
14 14
15 Bank1: 01 Bank1: 01 Register file address: 83 (HEX) (Binary) 9 bit address for direct addressing:
16 Flash program memory and ROM Thedata EEPROM and Flash program memory is readable and writable during normal operation. Not directly mapped in the register file space indirectly addressed d through hthe several SFR (EECON1, EECON2, EEDATA, EEDATH, EEADR, EEADRH) 16
17 Working register (W) Also called accumulator Aregisterthat is used to store the intermediate calculation results. Not part of the program or data memory space 17
18 I/O ports 18
19 I/O ports Bidirectional Five data direction registers: TRISA, B, C, D, E For PORTA, TRISA bit (= 1), PORTA pin being an input TRISA bit (= 0), PORTA pin being an output 19
20 I/O ports Multi functional Some pins for I/O ports are multiplexed with an alternate functionfor for the peripheral features on the device. E.g. AN analog input PSP parallel slave port 20
21 I/O ports 21
22 Instruction set 35 single word instructions Each instruction is a 14 bit word include: an opcode which h specifies the instruction ti type and one or more operands which further specify the operation of the instruction. 22
23 Instruction set 23
24 Instruction set In general, the instruction set is comprised of three basic categories: Byte oriented operations operation on W registor and indexed register E.g. addwf (add W and F) Bit oriented operations Operation on a register number and a bit number E.g. BCF (Bit Clear f) Literal and control operations: Include Call, Goto and Return 24
25 Control transfers 25
26 Control transfers 26
27 INSTRUCTION SET 27
28 28
29 Programming cycle 29
30 New folder with software 30
31 Copy the source code 31
32 32
33 Assemble source code 33
34 Assemble source code 34
35 Assemble source code 35
36 Assemble source code 36
37 Assemble source code 37
38 Downloading program 38
39 Downloading program 39
40 Downloading program 40
41 Downloading program 41
42 Downloading program 42
43 Downloading program 43
44 Downloading program 44
45 Downloading program 45
46 Downloading program 46
47 Downloading program 47
48 Downloading program 48
49 Downloading and running program 49
50 Running program 50
51 Downloading and running program 51
52 Thanks 52
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