93LC56 datasheet(16/22 Pages) MICROCHIP

16 / 22 page

DS00560D-page 16

Using the 93LC56 and 93LC66

16c5x/7x Cross-Assembler V4.12 Released

Mon Jun 06 10:49:20 1994

Page 1

Line

Opcode

0001

LIST P=16C54,c=132

0002

;****************************************************************

0003

;

3-Wire Sequential Read Program (93 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 ‘sequential read’ mode.

This means that the opcode

0009

;

and address are sent for the first address only.

After

0010

;

the first address is read, the Chip Select line is left

0011

;

high and clocks for the remaining 7 bytes are sent to the

0012

;

device. The device will automatically increment the address

0013

;

pointer in this mode, allowing the user to read as many

0014

;

consecutive addresses as needed. This program will repeat

0015

;

forever.

0016

;

0017

;

This program communicates to the serial EE in the

0018

;

x16 mode, and ASSUMES THE USER HAS SET THE ORG PIN

0019

;

ON THE DEVICE TO Vcc.

0020

;

0021

;

Timing is based on using the PIC16C54 in ‘XT’ mode

0022

;

using a 4MHz crystal.

Clock speeds to the serial EE

0023

;

will be approximately 50 kHz for this setup.

0024

;

0025

;

PIC16C54 to Serial EE Connections:

0026

;

0027

;

PIC16C54

Serial EE

0028

;

——————

0029

;

Pin 10 (RB4) —> Chip Select

0030

;

Pin 11 (RB5) —> Clock

0031

;

Pin 12 (RB6) —> Data In

0032

;

Pin 13 (RB7) —> Data Out

0033

;

ORG = Vcc

0034

;

0035

;************************************************************

0036

;

0037

;************************************************************

0038

0003

status

equ

; status register

0039

0005

port_a

equ

; port 5 (port_a)

0040

0006

port_b

equ

; port 6 (port b) used comm lines to serial EE

0041

000A

eeprom

equ

0ah

; bit buffer

0042

000C

addr

equ

0ch

; address register

0043

000D

datai

equ

0dh

; stored data input reg.

0044

000E

datao

equ

0eh

; stored data output reg.

0045

0010

txbuf

equ

10h

; transmit buffer

0046

0011

count

equ

11h

; bits transmitted so far

0047

0012

bits

equ

12h

; bits to transmit

0048

0013

bytcnt

equ

13h

; byte counter for read routine

0049

0015

loops

equ

15h

; delay loop counter

0050

0016

loops2

equ

16h

; delay loop counter

0051

0017

hbyte

equ

17h

; high byte for input data

16c5x/7x Cross-Assembler V4.12 Released

Mon Jun 06 10:49:20 1994

Page 2

Line

Opcode

0052

0018

lbyte

equ

18h

; low byte for input data

0053

;************************************************************

0054

;

Bit Assignments

0055

;************************************************************

0056

0007

equ

; eeprom input

0057

0006

equ

; eeprom output

0058

0007

datout

equ

; data out line (port_b)

0059

0006

datin

equ

; data in line (port_b)

0060

0005

sclk

equ

; clock line (port_b)

8-114

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