Oki ML490 Maintenance Manual - Page 14

The EEPROM contains menu data.

Page 14 highlights

(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 EEPROM EEDIN-P P24 D1 EECS-P P27 CS ; ; EEDOUT-P P25 DO EECLK-P P26 SK PRE = O PE = X EECS-P t CS EECLK-P EEDIN-P Operation Start code code Address 1 10 A5 A0 EEDOUT-P 0 D15 D0 D15 D0 D15 Read cycle timing (READ) PRE = O PE EECS-P t CS EECLK-P EEDIN-P Start Operation code code Address Data 10 1 A5 A0 D15 D0 EEDOUT-P Bus twp Ready Write cycle timing (WRITE) 42114101 Rev.1 14 /

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