hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 67

• 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
SS27–20: Specify the start position for driving the second screen by line. The liquid crystal is driven by
from the gate driver of “the set value + 1”. The second screen is driven when SPT = 1.
SE27–20: Specify the end position for driving the second screen by line. The liquid crystal is driven by to
the gate driver of “the set value + 1”. For instance, when SPT = 1, and SS27–20 = “20”H, SE27–20 =
“4F”H, the liquid crystal is driven from G33 to G80. Make sure that SS17–10 d SE17–10 < SS27–20 d
SE27–20 d “EF”H. For details, see the “Screen-split Drive Function” section.
Horizontal RAM Address Position (R44h)
Vertical RAM Address Position (R45h)
HSA7-0/HEA7-0: Specify the start/end positions of the window-address range in the horizontal direction
by address. Data are written to GRAM within the area determined by the addresses specified by HEA7-0
and HSA7-0. These addresses must be set before RAM write. In setting these bits, make sure that “00”h d
HSA7-0 d HEA7-0 d “AF”h.
VSA7-0/VEA7-0: Specify the start/end positions of the window-address range in the vertical direction by
address. Data are written to GRAM within the area determined by the addresses specified by VEA7-0 and
VSA7-0. These addresses must be set before RAM write. In setting these bits, make sure that “00”h d
VSA7-0 d VEA7-0 d “EF”h.
Rev.0.12, May 09 2003, page 67 of 156
R/W
W
W
RS
1
1
VSA
VEA
Note 1) The window address area is set within the GRAM address space.
Note 2) In the high-speed write mode, data are written to the GRAM every four words.
Note 3) The address set must be within the window address area. In the high-speed
HEA7 HEA6 HEA5 HEA4 HEA3 HEA2 HEA1 HEA0 HSA7 HSA6 HSA5 HSA4 HSA3 HSA2 HSA1 HSA0
VEA7 VEA6 VEA5 VEA4 VEA3 VEA2 VEA1 VEA0 VSA7 VSA6 VSA5 VSA4 VSA3 VSA2 VSA1 VSA0
IB15 IB14 IB13 IB12 IB11 IB10
Therefore, depending on the window address setting, dummy write operations
are required. For details, see the "High-Speed Burst RAM Write Function" section.
write mode, dummy write area must also be within the window address area.
0000h
HSA
GRAM address area and window-address range
GRAM address space
Window Address
HEA
IB9
IB8
EFAFh
IB7
Window address setting area
“00”h=< HSA7-0=< HEA7-0=< “AF”h
“00”h=< VSA7-0=< VEA7-0=< “EF”h
IB6
IB5
IB4
IB3
IB2
Preliminary
IB1
IB0