Casio PCR250 User Manual

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6-3. Data communication between CPU and EEPROM
CS : Chip enable
SK : Sirial data clock
DI : Serial data input
DO : Serial data outpu
EEPROM is a memory to possible write/erase by electricity .
The BR93LC46A privides efficient nonvolatile read/write memory arranged as 64 registers of 16
bits each.
(64 words X 16 bits = 1024 bits)
[Block diagram]
Command code
controller
Clock generator
Power detection
Write
protection
High voltage
genarator
Address
decorder
R/W
amplifier
Address
buffer
Data
register
Dammy bit
Command
register
1024 bit
EEPROM array
SK
CS
DI
DO
6 bits
6 bits
16 bits
16 bits
1
2
3
4
CS
SK
DI
DO
Pin No.23
Pin No.14
Pin No.15
Pin No.16
EEPROMCPU
BR93LC46A

Casio PCR250 Specifications

General

Brand	Casio
Model	PCR250
Category	Cash Register
Language	English