hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 77

• Manufacturer Part Number: hd66789
• Description: 528-channel, One-chip Driver For Amorphous Tft Panels With 262,144-color Display Ram, Power Supply Circuit, And Gate Circuit
• Manufacturer: Renesas Electronics Corporation.

HD66789
Data transmission synchronizing in 9-bit bus interface mode
The HD66789 supports a data transmission synchronizing function, which resets the upper/lower counter
that counts the number of transmission of upper/lower 9-bit data in the 9-bit bus interface mode. When a
discrepancy occurs in the upper/lower 9-bit data transmission due to effects from noise and so on, the “00”
H instruction is written 4 times consecutively to forcibly reset the upper/lower counter so that data
transmission restarts with an upper 9-bit data transmission. The excursion can be recovered by executing
the synchronizing function periodically.
Rev.0.12, May 09 2003, page 77 of 156
DB17-9
RD
WR
RS
Upper
Lower
9-bit data transmission synchronization
00H
(1)
00H
(2)
00H
(3)
00H
(4)
Upper
(9-bit transmission synchronization)
Lower
Preliminary