Oki PACEMARK 4410 Service Manual page 17

(5) EEPROM(IC40)
The EEPROM is a CMOS serial I/O type memory which is capable of electrically erasing and
writing 1,024 bits.
The EEPROM contains menu data.
The following shows the memory access operation.
NHDC LSI
EEPROMWR-P
EEPROMCS-P
EEPROMRD-P
EEPROMCLK-P
PRE = O
PE = X
EEPROMCS-P
EEPROMCLK-P
Start
code
1
EEPROMWR-P
EEPROMRD-P
PRE = O
PE
EEPROMCS-P
EEPROMCLK-P
Start
code
1
EEPROMWR-P
EEPROMRD-P
EEPROM
DI
CS
DO
SK
Read cycle timing (READ)
Operation
Address
code
0
1
A5 A0
0
D15
Write cycle timing (WRITE)
Operation
Address
code
0 A5 A0 D15
1
Figure 2.5
D0 D15 D0
t
CS
Data
D0
Bus
twp
16
t
CS
D15
Ready