hd66740 Renesas Electronics Corporation., hd66740 Datasheet - Page 22
hd66740
Manufacturer Part Number
hd66740
Description
112 X 80-dot Graphics Lcd Controller/driver - Hitachi Semiconductor
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66740.pdf
(95 pages)
- Current page: 22 of 95
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HD66740
Entry Mode
REV: Displays all graphics display sections with black-and-white reversal when SW = 0 and REV = 1.
For details, see the Reversed Display Function section.
I/D: When SW = 0, increments (I/D = 1) or decrements (I/D = 0) the CGRAM address by 1 when a data
is written into or read from the CGRAM.
CT5: Sets the most significant bit (CT5) for contrast adjustment when SW = 1. A 64-step adjustment is
also possible by using the CT4–CT0 bits which are set in the contrast-control 1/2 instruction.
RDM: When SW = 1 and RDM = 0, the RDM increments or decrements the address counter value
according to the I/D bit setting after reading the data from the CGRAM. When RDM = 1, the address
counter value is not updated after the data has been read from the CGRAM. The address counter value
is used when the RAM data is read, modified, and written.
must be continuously done twice. After writing to the RAM, the address counter value must be
updated.
R/W RS DB7
0
0
Figure 6
0
DB6 DB5 DB4 DB3 DB2 DB1
0
1
Entry Mode Set Instruction
0
22
0
REV
CT5
Since the first read data is invalid, the read
RDM
I/D
DB0
1
0
(SW = 0)
(SW = 1)
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