13. Dot Matrix LCD Controller (H8/3857 Group)
Rev.3.00 Jul. 19, 2007 page 330 of 532
REJ09B0397-0300
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
Index
Register
Name
Abbr.
R/W RS IR3 IR2 IR1 IR0
Index register
IR
W
0
⎯
⎯
⎯
⎯
Control
register
1
LR0
W 1 0 0 0 0
Control
register
2
LR1 W
1
Address
register
LR2 W
1
0
Frame
frequency
setting
register LR3 W
1
Display data register
LR4
R/W
1
0
0
Display
start
line
register
LR5 W
1
Blink
register
LR6 W
1
0
Blink start line register
LR8
W
1
0
0
0
Blink
end
line
register
LR9 W
1
Contrast
control
register
LRA W
1
0
13.2 Register
Descriptions
13.2.1 Index
Register
(IR)
7
⎯
⎯
⎯
6
⎯
⎯
⎯
5
⎯
⎯
⎯
4
⎯
⎯
⎯
3
IR3
0
W
0
IR0
0
W
2
IR2
0
W
1
IR1
0
W
Bit
Initial value
Read/Write
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.
Содержание F-ZTAT H8 Series
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