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93LC56 Datenblatt(PDF) 2 Page - Microchip Technology

Teilenummer 93LC56
Bauteilbeschribung  Lowpower 3-wire non-volatile memories
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

93LC56 Datenblatt(HTML) 2 Page - Microchip Technology

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DS00560D-page 2
© 1994 Microchip Technology Inc.
Using the 93LC56 and 93LC66
16c5x/7x Cross-Assembler V4.12 Released
Mon Jun 06 10:49:10 1994
Page 1
Line
PC
Opcode
0001
LIST P=16C54,c=132
0002
;****************************************************************
0003
;
3-Wire Byte Read Program (80 bytes)
0004
;
0005
;
This program demonstrates how to interface a
0006
;
Microchip PIC16C54 to a 93LC56 or 93LC66 Serial EE
0007
;
device.
This program will read 8 consecutive addresses
0008
;
in the ‘random read’ mode.
This means that the opcode
0009
;
and address for each byte will be sent to the device.
0010
;
This program will repeat forever.
0011
;
0012
;
Another, more efficient method of reading consecutive
0013
;
addresses is called the ‘sequential read’ mode.
This
0014
;
involves sending the opcode and address for the first
0015
;
byte to read, then continuing to provide clocks for the
0016
;
next addresses. The device will automatically increment
0017
;
the address.
An example of the sequential read mode is
0018
;
provided in the ‘3wseqr.asm’ file.
0019
;
0020
;
This program communicates to the serial EE in the
0021
;
x16 mode, and ASSUMES THE USER HAS SET THE ORG PIN
0022
;
ON THE DEVICE TO Vcc.
0023
;
0024
;
Timing is based on using the PIC16C54 in ‘XT’ mode
0025
;
using a 4Mhz crystal.
Clock speeds to the serial EE
0026
;
will be approximately 50 kHz for this setup.
0027
;
0028
;
PIC16C54 to Serial EE Connections:
0029
;
0030
;
PIC16C54
Serial EE
0031
;
——————
——————
0032
;
Pin 10 (RB4) —> Chip Select
0033
;
Pin 11 (RB5) —> Clock
0034
;
Pin 12 (RB6) —> Data In
0035
;
Pin 13 (RB7) —> Data Out
0036
;
ORG = Vcc
0037
;
0038
;************************************************************
0039
;
Register Assignments
0040
;************************************************************
0041
0003
status
equ
3h
; status register
0042
0005
port_a
equ
5h
; port 5 (port_a)
0043
0006
port_b
equ
6h
; port 6 (port b) comm lines to serial EE
0044
000A
eeprom
equ
0ah
; bit buffer
0045
000C
addr
equ
0ch
; address register
0046
000D
datai
equ
0dh
; stored data input reg.
0047
000E
datao
equ
0eh
; stored data output reg.
0048
0010
txbuf
equ
10h
; transmit buffer
0049
0011
count
equ
11h
; bits transmitted so far
0050
0012
bits
equ
12h
; bits to transmit
0051
0013
bytcnt
equ
13h
; byte counter for read routine
16c5x/7x Cross-Assembler V4.12 Released
Mon Jun 06 10:49:10 1994
Page 2
Line
PC
Opcode
0052
0015
loops
equ
15h
; delay loop counter
0053
0016
loops2
equ
16h
; delay loop counter
0054
0017
hbyte
equ
17h
; high byte for input data
0055
0018
lbyte
equ
18h
; low byte for input data
0056
;************************************************************
0057
;
Bit Assignments
0058
;************************************************************
0059
0007
di
equ
7
; eeprom input
0060
0006
do
equ
6
; eeprom output
8-100


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