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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0064
0065
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0090
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0100
0101
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01FF
0000
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0003
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0009
000A
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0006
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0000
0A2F
0000
0A2F
0C6E
0036
0000
0000
0000
0000
0000
0000
02F6
0A03
02F5
0A01
0800
0C8F
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)
;
;*************************************************************
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
movlw b’10001111'
16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:06 1994 Page 3
Line PC Opcode
0103 000F 0006
0104
tris port_b
; set port b for output
; except for the data out line
8
0105 0010 04C6
bcf
port_b,datin ; set datain and chipselect lines
0106 0011 0486
bcf
port_b,chpsel ; low just to check operation
0107 0012 04A6
bcf
port_b,sclk ; make sure clock starts low too.
0108 0013 0000
nop
0109
;
0110 0014 0586
bsf
port_b,chpsel ; set chip select line high
0111 0015 05C6
bsf
port_b,datin ; set data in line high
0112 0016 0000
nop
0113 0017 05A6
bsf
port_b,sclk ; set the clock line high to
0114
; generate the start bit
0115 0018 0000
nop
0116 0019 0000
nop
0117 001A 04A6
bcf
port_b,sclk ; set clock low again
0118 001B 0800
retlw 0
0119
;
0120
;*************************************************************
0121
;
BITOUT routine
0122
;
This routine takes one bit of data in ‘do’ and
0123
;
transmits it to the serial EE device
0124
;*************************************************************
© 1994 Microchip Technology Inc.
8-105
DS00560D-page 7
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