;I2C总线程序
;this is eeprom read & write programm
;the special store ram unit
w equ 0
f0 equ 0
rtCC equ 1
pc equ 2
f2 equ 2
f3 equ 3
f4 equ 4
ra equ 5
rb equ 6
rc equ 7
pclath equ 0ah
iNTCon equ 0bh
pir1 equ 0ch
tmr1l equ 0eh
tmr1h equ 0fh
t1con equ 10h
tmr2 equ 11h
t2con equ 12h
sspbuf equ 13h
sspcon equ 14h
ccpr1l equ 15h
ccpr1h equ 16h
ccpcon equ 17h
adcon0 equ 1fh
;
;in the bank1
trISA equ 85h
trisb equ 86h
trisc equ 87h
pcon equ 8eh
pie1 equ 8ch
pr2 equ 92h
sspadd equ 93h
sspstat equ 94h
adcon1 equ 9fh
;
;--------------------------------------------------------
;the genaral store ram unit
;
temp6 equ 76h
temp7 equ 77h
;
eepCTR equ 6dh ;eeprom control words buffer
eepaddr equ 6eh ;eeprom address buffer
eepdata equ 6fh ;eeprom data buffer
;
;--------------------------------------------------------
;the bits of ram unit
scl equ 3 ;rc
sda equ 4 ;rc
;
pd equ 3 ;status
to equ 4 ;status
;
rbif equ 0 ;intcon
intif equ 1 ;intcon
rtif equ 2 ;intcon
rbie equ 3 ;intcon
intie equ 4 ;intcon
rtie equ 5 ;intcon
adie equ 6 ;intcon
gie equ 7 ;intcon
;
;----------------------------------------------------------
;The contact
sda_in equ 10h
sda_out equ 00h
;
;----------------------------------------------------------
org 000h
goto main_program
;--------------------------------------------------------
; the son-program area
;--------------------------------------------------------
org 005h
;--------------------------------------------------------
make_s
bsf rc,sda
bsf f3,5
; bsf rc,sda
MOVlw sda_out
MOVwf trisc
bcf f3,5
nop
ack_check
bsf f3,5
; bcf rc,sda
MOVlw sda_in
MOVwf trisc
bcf f3,5
nop
m_start
bsf rc,scl
nop
btfss rc,sda
goto make_s
m_start0
bsf rc,scl
bcf rc,sda
bsf f3,5
; bsf rc,sda
MOVlw sda_out
MOVwf trisc
bcf f3,5
MOVlw 10100000b
btfsc sign,read_b
MOVlw 10100001b
MOVwf 6dh
MOVlw 6dh
MOVwf f4
w_byte
bsf f3,5
; bsf rc,sda
MOVlw sda_out
MOVwf trisc
bcf f3,5
MOVlw 08h
MOVwf temp2
bit_loop
nop
rlf f0
bcf rc,scl
btfss f3,0
goto ^+3
bsf rc,sda
goto ^+2
bcf rc,sda
nop
bsf rc,scl
decfsz temp2
goto bit_loop
nop
bcf rc,scl
bsf f3,5
; bcf rc,sda
MOVlw sda_in
MOVwf trisc
bcf f3,5
bsf rc,scl
nop
btfsc rc,sda
goto m_start0
bcf rc,scl
return
;
w_stop
m_stop
bcf rc,sda
bsf f3,5
; bsf rc,sda
MOVlw sda_out
MOVwf trisc
bcf f3,5
nop
bsf rc,scl
nop
bsf rc,sda
nop
bcf rc,scl
return
;
rd_bytes
nop
rnxtb
bcf rc,scl
bsf f3,5
; bcf rc,sda
MOVlw sda_in
MOVwf trisc
bcf f3,5
MOVlw 08h
MOVwf temp2
rnx
bcf rc,scl
nop
bcf f3,0
btfsc rc,sda
bsf f3,0
rlf f0
bsf rc,scl
nop
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本文关键字：单片机 软件 PIC单片机，单片机-工控设备 - PIC单片机
