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
0062
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0064
0065
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0101
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01FF
0000
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0010
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0001
0000
0A26
0000
0A26
0C19
0036
0000
02F6
0A03
0800
eeprom equ 0ah
; bit buffer
addr equ 0ch
; address register
datai equ 0dh
; stored data input reg.
datao equ 0eh
; stored data output reg.
txbuf equ 10h
; transmit buffer
count equ 11h
; bits transmitted so far
bits equ 12h
; bits to transmit
bytcnt equ 13h
; byte counter for write routine
loops equ 15h
; delay loop counter
loops2 equ 16h
; delay loop counter
;************************************************************
;
Bit Assignments
;************************************************************
di
equ 7
; eeprom input
do
equ 6
; eeprom output
datout equ 7
; data out line (port_b)
datin equ 6
; data in line (port_b)
sclk equ 5
; clock line (port_b)
chpsel equ 4
; chip select line (port_b)
timeout equ 1
; write cycle timeout warning (port_a)
;
;*************************************************************
org 01ffh
begin goto PWRUP ; set the reset vector
org 000h
goto PWRUP
;
;*************************************************************
;
DATA POLL DELAY ROUTINE
;
This routine delays 100 us is
;
used for delay between polls
;*************************************************************
dpdelay
;
movlw .25
; timing adjustment variable
movwf loops2
top
nop
decfsz loops2
; loops complete?
goto top
; no, go again
;
retlw 0
; yes, return from sub
;
16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:00 1994 Page 3
Line PC Opcode
0103
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0115
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0123
0124
0007
0008
0009
000A
000B
000C
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000E
000F
0010
0011
0012
04C6
0486
04A6
0000
0586
05C6
0000
05A6
0000
0000
04A6
0800
;**************************************************************
;
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
;
bsf
port_b,chpsel ; set chip select line high
bsf
port_b,datin ; set data in line high
nop
bsf
port_b,sclk ; set the clock line high to
; generate the start bit
nop
nop
bcf
port_b,sclk ; set clock low again
retlw 0
;
;*************************************************************
DS00560D-page 12
8-110
© 1994 Microchip Technology Inc.
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