HD66773R Datasheet, PDF (71/133 Pages) Renesas Technology Corp – 262,144-color, 132 x 176-dot Graphics Controller Driver for TFT LCD panels

HD66773R
The number of RAM access when writing data in the horizontal direction must be made 4 × N times by
including the dummy writes.
Horizontal RAM write = start dummy write + write data + end dummy write = 4 × N (times)
An example of RAM write in high speed RAM write mode with the window address is as follows.
The RAM data in the specified window-address range is written over consecutively in high speed by
inserting two dummy writes at the start of the line and three dummy writes at the end of the line.
Write in the horizontal direction
AM = 0, ID0 = 1
Window address-range setting
HSA=h12, HEA=h30
VSA=h08, VEA=hA0
Set high-speed RAM
Write mode _{HWM = 1}
Address set
AD = h0810 *See Note
Dummy RAM write x 2
RAM write x 31
Dummy RAM write x 3
h0000
GRAM address map
h0812
Window address
Range
(Write-over area)
hA030
Window address-range setting
HSA=h12, HEA=h30
VSA=h08, VEA=hA0
hEFAF
x 152
*Note: Set the lower two bits of the address as follows
in the high-speed write mode.
When ID0 = “0”, the lower two bits of the address must be set to “11”.
When ID1 = “0”, the lower two bits of the address must be set to “00”.
The RAM-address range to be overwritten is limited to the area specified
with the window address.
Rev.1.10, Jun.21.2003, page 71 of 133