hd66765 Renesas Electronics Corporation., hd66765 Datasheet - Page 43

• Manufacturer Part Number: hd66765
• Description: 396-channel Segment Driver With Internal Ram For 4096-color Displays - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

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).
Figure 32 Example of the High-Speed RAM Write with a Window Address-Range Specification
Writing in the horizontal direction
Window address-range setting
High-speed RAM write mode
HSA = "12"h, HEA = "30"h
VSA = "80"h, VEA = "A0"h
Dummy RAM write
Dummy RAM write
setting HWM = 1
AM = 0, ID0 = 1
RAM write
AD = "8010"h *
Address set
Note: The address set for the high-speed RAM write must be 00 or 11 according to
the value of the ID0 bit. Only RAM in the specified window address-range
will be overwritten.
31
2
3
152
43
"0000"h
"8012"h
Window address-range setting
HSA = "12"h, HEA = "30"h
VSA = "80"h, VEA = "A0"h
Window address-range
specification (rewrite area)
GRAM address map
"A030"h
HD66765
"A083"h