pic12i2c.sdi

该应用软件可以实现大多数单片机的仿真实验

,,,        LIST    p=12CE518 ;
,,,        #include "P12CE518.INC" ; Include header file
,,,        LIST
,,,; P12CE518.INC  Standard Header File, Version 1.00    Microchip Technology, Inc.
,,,        LIST
,,,
,,,
,,,        cblock 0x10
,,,        result
,,,        count
,,,        endc
,,,
,,,        ; Vector for normal start up.
,,,        org     0
0000,0A01,,        goto    start
,,,
,,,
,,,; Main program starts here:
0001,0C3C,start,start   movlw 0x3C
0002,0006,,        tris  GPIO
,,,
,,,
,,,; Write a byte
0003,0C00,,        movlw 0
0004,003B,,        movwf EEADDR
0005,0C85,loop,loop    movlw 0x85
0006,003C,,        movwf EEDATA
0007,0925,,        call WRITE_BYTE
0008,0030,,        movwf result
,,,
0009,0916,,        call serout
,,,
,,,; Wait for INT high
000A,0746,wait1,wait1   btfss GPIO,2
000B,0A0A,,        goto wait1
,,,
,,,;Read it back
,,,
000C,0CFF,,        movlw 0xFF
000D,003C,,        movwf EEDATA
,,,
000E,0922,,        call READ_CURRENT
000F,021C,,        movfw EEDATA
0010,0030,,        movwf result
0011,0916,,        call serout
,,,
,,,; Wait for INT low
0012,0646,wait2,wait2   btfsc GPIO,2
0013,0A12,,        goto wait2
,,,
0014,02BB,,        incf EEADDR,F
0015,0A05,,        goto loop
,,,
,,,;Serial output of result
0016,0C08,serout,serout  movlw 8                 ;Loop for 8 bits
0017,0031,,        movwf count
0018,0CC0,loop1,loop1   movlw 0xC0              ;Start with a zero except for SDA/SCL
0019,06F0,,        btfsc result,7          ;Test result bit
001A,0D01,,        iorlw 0x01
001B,0026,,        movwf GPIO              ;Output data bit to port on GP0
001C,0526,,        bsf GPIO,1              ;Generate Clock pulse on GP1
001D,0426,,        bcf GPIO,1
001E,0370,,        rlf result,F            ;Get next result bit
001F,02F1,,        decfsz count,F          ;Loop for next bit
0020,0A18,,        goto loop1
0021,0800,,        return
,,,
,,,
,,,
,,,        #include fl51xinc.asm
,,,        TITLE "PIC with Flash EE data memory Interface"
,,,;
,,,;       Program:          FL51XINC.ASM  V1.10
,,,;       Revision Date:
,,,;                         09-09-97      Adapted to 12C51x parts
,,,;                         01-Apr-1999   Added emulation hooks
,,,;
,,,
,,,; #define EMULATED    ; comment this line out for use on real part
,,,
,,,; PIC12C51X EEPROM communication code.  This code should be included in
,,,; with the application.  These routines provide the following functionality:
,,,; write a byte to a specified address.
,,,; read a byte from a specified address.
,,,; read a byte from the next address.
,,,;
,,,; Emulation Requires:
,,,;     MPLAB-ICE
,,,;     PCM16XA0 processor module
,,,;     DVA12XP80 Device Adapter.
,,,; Define EMULATOR at the top of this file  (#define EMULATOR)
,,,;     This will set the I2C_PORT, SDA and SCL lines to communicate over
,,,;     Port A, pins 0 and 1.  It also assembles in the necessary TRIS
,,,;     instructions to allow reading from the SDA line.
,,,;
,,,; To convert the code for the actual part, simply comment out the #define EMULATOR
,,,; line and reassemble.
,,,;
,,,; FL51XTST.ASM is also provided for linker users.
,,,;
,,,; INTRODUCTION:
,,,; The Microchip 12c51x family of microntrollers are multichip modules
,,,; which contain a PIC12C508 microcontroller and a 24LC00 EEPROM.
,,,; This application note is intended to provide users with highly compressed
,,,; assembly code for communication between the EEPROM and the Microcontroller,
,,,; which will leave the user a maximum amount of code space for the core
,,,; application.
,,,;
,,,;***************************************************************************
,,,;***************************  EEPROM Subroutines  **************************
,,,;***************************************************************************
,,,; Communication for EEPROM based on I2C protocall, with Acknowledge.
,,,;
,,,; Byte_Write: Byte write routine
,,,;       Inputs:  EEPROM Address   EEADDR
,,,;                EEPROM Data      EEDATA
,,,;       Outputs: Return 01 in W if OK, else return 00 in W
,,,;
,,,; Read_Current: Read EEPROM at address currently held by EE device.
,,,;       Inputs:  NONE
,,,;       Outputs: EEPROM Data       EEDATA
,,,;                Return 01 in W if OK, else return 00 in W
,,,;
,,,; Read_Random: Read EEPROM byte at supplied address
,,,;       Inputs:  EEPROM Address    EEADDR
,,,;       Outputs: EEPROM Data       EEDATA
,,,;                Return 01 in W if OK, else return 00 in W
,,,;
,,,; Note: EEPROM subroutines will set bit 7 in PC_OFFSET register if the
,,,;       EEPROM acknowledged OK, else that bit will be cleared.  This bit
,,,;       can be checked instead of refering to the value returned in W
,,,;***************************************************************************
,,,
,,,; OPERATION:
,,,; For detailed operating information and other important information about
,,,; this code, see AN571.  This code was derived from AN571, with changes
,,,; as appropriate for the specific hardware in the PIC12C51x parts.
,,,;**********************************************************************
,,,
,,,
,,,;***************************************************************************
,,,;***************************  Variable Listing  ****************************
,,,;***************************************************************************
,,,OK          EQU     01H
,,,NO          EQU     00H
,,,
,,,#ifdef  EMULATED
,,,I2C_PORT    EQU     5           ; Port A control register, used for I2C
,,,SCL         EQU     01H         ; EEPROM Clock, SCL (I/O bit 7)
,,,SDA         EQU     00H         ; EEPROM Data,  SDA (I/O bit 6)
,,,#else
,,,I2C_PORT    EQU     GPIO        ; Port B control register, used for I2C
,,,SCL         EQU     07H         ; EEPROM Clock, SCL (I/O bit 7)
,,,SDA         EQU     06H         ; EEPROM Data,  SDA (I/O bit 6)
,,,#endif
,,,
,,,EE_OK       EQU     07H         ; Bit 7 in PC_OFFSET used as OK flag for EE
,,,
,,,        cblock 0x1A
,,,PC_OFFSET                       ; PC offset register (low order 4 bits),
,,,                                ;  value based on operating mode of EEPROM.
,,,                                ;  Also, bit 7 used for EE_OK flag
,,,EEADDR                          ; EEPROM Address
,,,EEDATA                          ; EEPROM Data
,,,EEBYTE                          ; Byte sent to or received from
,,,                                ; EEPROM (control, address, or data)
,,,COUNTER                         ; Bit counter for serial transfer
,,,        endc
,,,
,,,
,,,;***************************************************************************
,,,;***************************  EEPROM Subroutines  **************************
,,,;***************************************************************************
,,,; Communication for EEPROM based on I2C protocall, with Acknowledge.
,,,;
,,,; WRITE_BYTE: Byte write routine