BenQ G2420HD, Product Service Manual

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Change Power Status D0 Data XX
cksu
m

PowerOFF: Data=AA
PowerON: Data=Other
Value
Change Language Type D1 Data XX
ckssu
m

Asia: Data=AA
European: Data=Other
Value
EEPROM Bank R/W (For Debug using only, not for Production Line Write EEPROM directly)
Read EEPROM Bank 0 B0
Addr
ess XX
cksu
m

Read EEPROM Bank 1 B1
Addr
ess XX
cksu
m

Read EEPROM Bank 2 B2
Addr
ess XX
cksu
m

(For 24C08 type)
Read EEPROM Bank 3 B3
Addr
ess XX
cksu
m

(For 24C08 type)
Write EEPROM Bank 0 B8
Addr
ess Data
cksu
m

Write EEPROM Bank 1 B9
Addr
ess Data
cksu
m

Write EEPROM Bank 2 BA
Addr
ess Data
cksu
m

(For 24C08 type)
Write EEPROM Bank 3 BB
Addr
ess Data
cksu
m

(For 24C08 type)
Note A: Byte4 (cksum) = Byte1 + Byte2 + Byte3
Note B: Data = The value write to MCU or EEPROM
Note C: XX = don't care, any value (<=0xFF).
When PC Host sends 0x7D command to MCU, MCU must return as following (2 bytes)
Return Code
R-Byte1 R-Byte2
Checksum error code FC AA
Normal return code the above Byte3 (/data) FC
If normal return code is exact FCh FC CF