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dsPICDEM? MC1H 3-Phase High Voltage Power Module
B.1
PIC ? MCU CODE AND DATA CYCLE DIAGRAM FOR SERIAL INTERFACE
;**********************************************************
;* 50_10_v3.ASM
;**********************************************************
;* Smart Power Solutions LLP
;* 13th April 2003
;* Assembled with MPLAB v6.13
;**********************************************************
;* This program continuously converts two ADC channels, AN0
;* & AN2 and writes the results out via SPI followed by a
;* control word 0xF9.
;* The software latency of the SPI transmission
;* is used to fulfill the aquire, conversion & wait time of
;* the ADC module for maximum data transmission rate.
;* If transmission is corrupted, MCLR is asserted to re-sync
;* transmission, therefore no watchdog is required.
;* SPI clock, SCK, is GP5 pin 2 idle low and data is valid on
;* the falling edge. SPI data out line, SDO, is PGP4 pin 3.
;* Use config word 0xE4 when programming
;**********************************************************
list p=12c671
; Include file, change directory if needed
include "p12c671.inc"
BYTE_TO_SEND
STARTUP_TIMER
SCK
SDO
EQU
EQU
EQU
EQU
0x20
0x21
0x05
0x04
; Start at the reset vector
org 0x000
Start
;begin in bank0 initially
clrf
GPIO
;Clear GPIO
bsf STATUS,5
movlw 0x0f
movwf TRISIO
movlw 0X02
movwf ADCON1
call 0x03ff
movwf OSCCAL
;select bank1
;GP5, GP4 outputs
;also in bank 1
;AD0,AD1 and AD2 are analog channels
;with VDD and VSS references
;factory programmed data to trim
;internal oscillator
DS70096A-page 48
clrf
STATUS
;select bank0 FOR REST OF CODE
? 2003 Microchip Technology Inc.
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