AN560 데이터 시트보기 (PDF) - Microchip Technology
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AN560 Datasheet PDF : 22 Pages
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Using the 93LC56 and 93LC66
0061
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0036
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02F6
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04C6
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04A6
0000
chpsel equ 4
; chip select line (port_b)
;
;*************************************************************
org 01ffh
begin goto PWRUP ; set the reset vector
org 000h
goto PWRUP
;
;*************************************************************
;
DELAY ROUTINE
;
This routine takes the value in ‘loops’
;
and multiplies it times 1 millisecond to
;
determine delay time.
;*************************************************************
WAIT
;
top
movlw .110
; timing adjustment variable
movwf loops2
top2
nop
; sit and wait
nop
nop
nop
nop
nop
decfsz loops2
; inner loops complete?
goto top2
; no, go again
;
decfsz loops
; outer loops complete?
goto top
; no, go again
retlw 0
; yes, return from sub
;
;**************************************************************
;
Start Bit Subroutine
;
this routine generates a start bit
;
(Chip select and DI high when clock goes high)
;**************************************************************
BSTART
bcf
port_b,datin ; set datain and chipselect lines
bcf
port_b,chpsel ; low just to check operation
bcf
port_b,sclk ; make sure clock starts low too.
nop
;
16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:20 1994 Page 3
Line PC Opcode
0103 0012 0586
0104 0013 05C6
bsf
port_b,chpsel ; set chip select line high
bsf
port_b,datin ; set data in line high
8
0105 0014 0000
nop
0106 0015 05A6
bsf
port_b,sclk ; set the clock line high to
0107
; generate the start bit
0108 0016 0000
nop
0109 0017 0000
nop
0110 0018 04A6
bcf
port_b,sclk ; set clock low again
0111 0019 0800
retlw 0
0112
;
0113
;**************************************************************
0114
;
BITIN routine reads one bit of data from the
0115
;
serial EE device and stores it in ‘di’
0116
;**************************************************************
0117
BITIN
0118 001A 05EA
bsf
eeprom,di
; assume input bit is high
0119 001B 05A6
bsf
port_b,sclk ; set clock line high
0120 001C 0000
nop
;
0121 001D 07E6
btfss port_b,datout ; read the data bit
0122 001E 04EA
bcf
eeprom,di
; input bit was low
0123 001F 04A6
bcf
port_b,sclk ; set clock line low
0124
;
© 1994 Microchip Technology Inc.
8-115
DS00560D-page 17
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