H8-3857 Datasheet, PDF (354/560 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcomputer

13. Dot Matrix LCD Controller (H8/3857 Group)
13.1.4 Register Configuration
The LCD controller has one index register and ten control registers, all of which are accessed via
an I/O port interface. Except for the display data register (LR4), these registers cannot be read.
The LCD controller register configuration is shown in table 13.2.
Table 13.2 Register Configuration
Name
Index register
Control register 1
Control register 2
Address register
Frame frequency setting register
Display data register
Display start line register
Blink register
Blink start line register
Blink end line register
Contrast control register
Abbr.
IR
LR0
LR1
LR2
LR3
LR4
LR5
LR6
LR8
LR9
LRA
R/W RS
W0
W1
W
W
W
R/W
W
W
W
W
W
Index Register
IR3 IR2 IR1 IR0
⎯⎯⎯⎯
0
0
0
0
1
1
0
1
1
0
0
1
1
0
1
0
0
0
1
1
0
13.2 Register Descriptions
13.2.1 Index Register (IR)
Bit
7
6
5
⎯
⎯
⎯
Initial value
⎯
⎯
⎯
Read/Write
⎯
⎯
⎯
4
3
2
1
0
⎯
IR3
IR2
IR1
IR0
⎯
0
0
0
0
⎯
W
W
W
W
IR is an 8-bit write-only register that selects one of the LCD controller's ten control registers. IR is
selected when RS is 0.
Upon reset, IR is initialized to H'00.
Bits 7 to 4—Reserved Bits: Bits 7 to 4 are reserved; they should always be cleared to 0.
Rev.3.00 Jul. 19, 2007 page 330 of 532
REJ09B0397-0300