AN560 データシートの表示（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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0070
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0090
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0101
0102
01FF
0000
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0009
000A
000B
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000F
0010
0011
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0000
0A33
0000
0A33
04C6
0486
04A6
0000
0586
05C6
0000
05A6
0000
0000
04A6
0800
05EA
05A6
0000
07E6
04EA
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
;
;**************************************************************
;
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
;
;**************************************************************
;
BITIN routine reads one bit of data from the
;
serial EE device and stores it in ‘di’
;**************************************************************
BITIN
bsf
eeprom,di
; assume input bit is high
bsf
port_b,sclk ; set clock line high
nop
;
btfss port_b,datout ; read the data bit
bcf
eeprom,di
; input bit was low
16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:10 1994 Page 3
Line PC Opcode
0103 0012 04A6
0104
bcf
port_b,sclk ; set clock line low
;
8
0105 0013 0800
retlw 0
;
0106
0107
;****************************************************************
0108
;
Receive data routine
0109
;
This routine reads one byte of data from the part
0110
;
into the ‘datai’ register.
0111
;****************************************************************
0112
RX
0113 0014 006D
clrf datai
; clear input buffer
0114 0015 0C08
movlw .8
; set # bits to 8
0115 0016 0031
movwf count
0116 0017 0403
bcf
status,0
; make sure carry bit is low
0117 0018 036D RXLP
rlf
datai
; rotate the buffer left 1 bit
0118 0019 090D
call BITIN
; read 1 bit
0119 001A 040D
bcf
datai,0
; assume the input bit was low
0120 001B 06EA
btfsc eeprom,di
; check the bit
0121 001C 050D
bsf
datai,0
; set high if neccessary
0122 001D 02F1
decfsz count
; 8 bits done?
0123 001E 0A18
goto RXLP
; no, do another
0124 001F 0800
retlw 0
© 1994 Microchip Technology Inc.
8-101
DS00560D-page 3
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