hd66789 Renesas Electronics Corporation., hd66789 Datasheet - Page 35

• 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
LG2–0: Rewrite data to GRAM after comparing the data that are written by the microcomputer to GRAM
with the values in the compare registers (CP17–0) and performing logical operation. For details, see the
“Graphics Operation function”
CP17–0: Set the value for the compare register, with which the data read out from GRAM or data written
to GRAM by the microcomputer are compared. This function is not available with the external display
interface mode. In the external display interface mode, make sure LG2-0 = “000”.
BGR: Reverse the order from R, G, B to B, G, R to the 18-bit data to write to GRAM. When setting BGR
= 1, CP17-0 and WM17-0 bits will be automatically changed to the same effect.
Rev.0.12, May 09 2003, page 35 of 156
AM="0”
horizontal
AM="1”
vertical
Write data to GRAM
Write data to
GRAM (WM17-0)
Logical/compare operation
I/D1-0="00”
horizontal : decrement
vertical : decrement
0000h
0000h
Note 2)
(LG2-0)
Note 1)
0
Logical operation (write data)
LG2-0 = 000: Replacement
Note 1) Data write to GRAM is executed by 18 bits. Logical operation is also executed by 18 bits.
Note 2) Write data mask (WM17-0) is set with the RAM write data mask register.
EFAFh
EFAFh
0
As to the assignment of bits, see the description regarding each bit data bus interface.
Address transition direction
Logic/Compare Operation
0
Note : Data are written only on the GRAM area specified with the window
I/D1-0="01”
horizontal : increment
vertical : decrement
0000h
0000h
Conversion between RGB and BGR (BGR)
0
addresses when window addresses are set.
0
Write data mask (WM17-0)
0
EFAFh
EFAFh
0
Compare operation (with compare register)
LG2-0 = 110: Replacement of matched write data
LG2-0 = 111: Replacement of unmatched write data
GRAM
1
18 bits
I/D1-0="10”
horizontal : decrement
vertical : increment
0000h
0000h
1
1
0
0
EFAFh
EFAFh
1
1
I/D1-0="11”
horizontal : increment
vertical : increment
0000h
0000h
1
0
Preliminary
EFAFh
EFAFh