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93LC56 データシート(PDF) 9 Page - Microchip Technology

部品番号 93LC56
部品情報  Lowpower 3-wire non-volatile memories
Download  22 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

93LC56 データシート(HTML) 9 Page - Microchip Technology

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© 1994 Microchip Technology Inc.
DS00560D-page 9
Using the 93LC56 and 93LC66
8
0189
003B
0032
movwf
bits
;
0190
003C
0CC0
movlw
b’11000000'
; get opcode and address
0191
;
(11XXXXXX)
0192
003D
0030
movwf
txbuf
; into output buffer
0193
003E
0925
call
TX
; and transmit it
0194
003F
0486
bcf
port_b,chpsel
; set chip select line low
0195
0040
0000
nop
0196
;
0197
;
Now continue on to the write command
0198
;
0199
;**************************************************************
0200
;
Byte Write Routine
0201
;
This routine writes an AA55h pattern into
0202
;
8 consecutive addresses starting at address 00.
0203
;
A delay of about 10ms is given after each byte
0204
;
for the write cycle to complete.
16c5x/7x Cross-Assembler V4.12 Released
Mon Jun 06 10:49:06 1994
Page 5
Line
PC
Opcode
0205
;
The write is done in the x16 mode: the user must
0206
;
have the ORG pin tied to Vcc on the device
0207
;****************************************************************
0208
WRITE
0209
;
0210
0041
0C00
movlw
.0
; set starting address to 00
0211
0042
002C
movwf
addr
;
0212
0043
0C08
movlw
.8
; set number of bytes to write as 8
0213
0044
0033
movwf
bytcnt
;
0214
;
0215
0045
090E
topwr
call
BSTART
; generate the start bit
0216
;
0217
0046
0C02
movlw
.2
; set # bits to 2 for the opcode
0218
0047
0032
movwf
bits
;
0219
0048
0C40
movlw
b’01000000'
; get opcode (01b)
0220
0049
0030
movwf
txbuf
; into the transmit buffer
0221
004A
0925
call
TX
; and send it
0222
;
0223
004B
0C08
movlw
.8
; set # of bits to 8 for the
0224
004C
0032
movwf
bits
; address
0225
004D
020C
movf
addr,w
; get address counter
0226
004E
0030
movwf
txbuf
; into output buffer
0227
004F
0925
call
TX
; and send it
0228
0050
0CAA
movlw
b’10101010'
; get upper byte of data (AAh)
0229
0051
0030
movwf
txbuf
; into the transmit buffer
0230
0052
0925
call
TX
; and send it
0231
0053
0C55
movlw
b’01010101'
; get lower byte of data (55h)
0232
0054
0030
movwf
txbuf
; into transmit buffer
0233
0055
0925
call
TX
; and send it
0234
;
0235
0056
0486
bcf
port_b,chpsel ; clear the chip select line
0236
; to initiate write cycle
0237
;
0238
0057
0C0A
movlw
.10
;
0239
0058
0035
movwf
loops
; set delay time to 10mS
0240
0059
0901
call
WAIT
; and wait
0241
;
0242
005A
02AC
incf
addr
; increment address counter
0243
005B
02F3
decfsz
bytcnt
; all bytes written?
0244
005C
0A45
goto
topwr
; no, do another
0245
; yes, go on
0246
;
0247
;
Now continue on to the erase/write disable command
0248
;
0249
;****************************************************************
0250
;
EWDS (Erase/Write Disable Routine)
0251
;
This routine executes the erase/write disable command
0252
;
which prevents the contents of the array from being
8-107


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