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93LC56 Datasheet(PDF) 15 Page - Microchip Technology

Part # 93LC56
Description  Lowpower 3-wire non-volatile memories
PDF  22 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

93LC56 Datasheet(HTML) 15 Page - Microchip Technology

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© 1994 Microchip Technology Inc.
DS00560D-page 15
Using the 93LC56 and 93LC66
8
0253
0056
0A52
goto
polltop
; no, check again
0254
0057
0525
bsf
port_a,timeout; yes, set timeout LED and go on
0255
0058
0A5A
goto
badpoll
;
16c5x/7x Cross-Assembler V4.12 Released
Mon Jun 06 10:49:00 1994
Page 6
Line
PC
Opcode
0256
0257
0059
0425
okpoll
bcf
port_a,timeout; clear the timeout LED
0258
005A
0486
badpoll
bcf
port_b,chpsel ; chip sel line back low
0259
005B
02AC
incf
addr
; increment address counter
0260
005C
02F3
decfsz
bytcnt
; all bytes written?
0261
005D
0A3C
goto
topwr
; no, do another
0262
; yes, go on
0263
;
0264
;
Now continue on to the erase/write disable command
0265
;
0266
;****************************************************************
0267
;
EWDS (Erase/Write Disable Routine)
0268
;
This routine executes the erase/write disable command
0269
;
which prevents the contents of the array from being
0270
;
written to.
0271
;
0272
;****************************************************************
0273
EWDS
0274
;
0275
005E
0907
call
BSTART
; generate a start bit
0276
;
0277
005F
0C02
movlw
.2
; set # bits to 2
0278
0060
0032
movwf
bits
;
0279
0061
0C00
movlw
b’00000000'
; get the opcode (00b)
0280
0062
0030
movwf
txbuf
; into the output buffer
0281
0063
091C
call
TX
; and transmit it
0282
0064
0C08
movlw
.8
; set # bits to 8
0283
0065
0032
movwf
bits
;
0284
0066
0C00
movlw
b’00000000'
; get opcode and address
0285
;
(00XXXXXX)
0286
0067
0030
movwf
txbuf
; into output buffer
0287
0068
091C
call
TX
; and transmit it
0288
0069
0486
bcf
port_b,chpsel
; set chip select line low
0289
006A
0000
nop
0290
006B
0A2B
goto
EWEN
; start all over
0291
;
0292
;
0293
0294
0000
END
8-113



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