HD66766R Datasheet, PDF (42/97 Pages) Hitachi Semiconductor – 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors

HD66766R
Rev. 1.0-1 / September 2002
Note: Transfer synchronization function for an 8-bit bus interface
The HD66766R supports the transfer synchronization function which resets the upper/lower
counter to count upper/lower 8-bit data transfer in the 8-bit bus interface. Noise causing transfer
mismatch between the eight upper and lower bits can be corrected by a reset triggered by
consecutively writing a “00”H instruction four times. The next transfer starts from the upper
eight bits. Executing synchronization function periodically can recover any runaway in the display
system
RS
R/W
E
DB15 to
DB8
Upper or
lower
"00"H
(1)
"00"H
(2)
"00"H
(3)
"00"H
(4)
Upper
Lower
8-bit transfer synchronization
Figure 28 8-bit Transfer Synchronization
42