Oki ML490 Maintenance Manual page 14

(5) EEPROM
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.
MPU
P24
P27
P25
P26
PRE = O
PE = X
EECS-P
EECLK-P
EEDIN-P
EEDOUT-P
EECS-P
EECLK-P
EEDIN-P
EEDOUT-P
42114101 Rev.1
EEDIN-P
EECS-P
EEDOUT-P
EECLK-P
Operation
Start
code Address
code
0
1 1
A5
Read cycle timing (READ)
PRE = O
PE
Operation
Start Address
code
code
0 A5
1 1
Write cycle timing (WRITE)
EEPROM
D1
CS
DO
SK
A0
0
D15 D0 D15 D0
t
CS
Data
A0 D15 D0
Bus
twp
t
CS
D15
Ready
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