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
0125
0126
0127
0128
0129
0130
0131
0132
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0137
0138
0139
0140
0141
0142
0143
0144
0145
0146
0147
0148
0149
0150
0151
0152
0153
0020
0021
0022
0023
0024
0025
0026
0027
0028
0029
002A
002B
07CA
0A24
05C6
0A25
04C6
05A6
0000
04A6
0800
0212
0031
04CA
;
;*************************************************************
;
BITOUT routine
;
This routine takes one bit of data in ‘do’ and
;
transmits it to the serial EE device
;*************************************************************
BITOUT
btfss eeprom,do
; check state of data bit
goto bitlow
; low, goto bitlow
bsf
port_b,datin ; high, set datain high
goto clkout
; and clock it
;
bitlow bcf
port_b,datin ; output a logic low
clkout bsf
port_b,sclk ; set clock line high
nop
bcf
port_b,sclk ; return clock line low
retlw 0
;
;****************************************************************
;
Transmit Data Subroutine
;
This routine takes the byte of data stored in the
;
‘datao’ register and transmits it to the serial EE device.
;****************************************************************
TX
movf bits,w
; set the number of bits to xmit
movwf count
;
TXLP
bcf
eeprom,do
; assume bit 7 is low
16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:10 1994 Page 4
Line PC Opcode
0154
0155
0156
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0188
002C
002D
002E
002F
0030
0031
0032
0033
0034
0035
06F0
05CA
0920
0370
02F1
0A2B
0800
0C00
0005
0065
btfsc txbuf,7
; is bit 7 clear?
bsf
eeprom,do
; no, set data bit =1
call BITOUT
; transmit 1 bit to serial EE
rlf
txbuf
; rotate txbuf left
decfsz count
; all bits done?
goto TXLP
; no, do another bit
retlw 0
; yes, jump out
;
;****************************************************************
;
POWER-UP ROUTINE
;
This is the program entry point, which in this case simply
;
sets the port_a I/O lines and directs control to the
;
read routine.
;*****************************************************************
PWRUP
;
movlw b’00000000'
tris port_a
; set port_a as all output
clrf port_a
; all lines low
0036
0037
0038
0039
0C80
0006
0C00
002C
movlw b’10000000'
tris port_b
; set RB7 as input, rest output;
;
;
Fall through and do the read
;
;*********************************************************************
;
READ ROUTINE
;
This routine reads 8 consecutive addresses in
;
random mode starting at address 0. This is done in
;
x16 mode and will repeat forever.
;*********************************************************************
READ
;
movlw .0
; set starting address to 00
movwf addr
;
DS00560D-page 4
8-102
© 1994 Microchip Technology Inc.
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