HD66766R Datasheet, PDF (49/97 Pages) Hitachi Semiconductor – 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors

HD66766R
Rev. 1.0-1 / September 2002
An example of high-speed RAM write with a window address-range specified is shown below.
The window address-range can be rewritten to consecutively and quickly by inserting two dummy writes
at the start of a row and three dummy writes at the end of a row, as determined by using the window
address-range specification bits (HSA1 to 0= “10”, HEA1 to 0= “00”).
Writing in the horizontal
direction AM=0, I/D0=1
Window address-range setting
HSA=h12, HEA=h30
VSA=h08, VEA=hA0
High-speed RAM write mode
setting HWM=1
h0000
GRAM address map
h0812
Window address-range
specification (rewrite area)
Address set
AD=h0810 Note 1)
hA030
hAF83
Dummy RAM write x 2
RAM write x 31
x 152
Window address-range setting
HSA=h12, HEA=h30
VSA=h08, VEA=hA0
Dummy RAM write x 3
Note1) The address set for the high-speed RAM write must be 00 or 11 according to the value of I/D0 bit.
Only RAM in the speicfied window address-range will be overwritten.
Figure 35 Example of the High-Speed RAM write with a window address-range specification
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