Register Descriptions; Index Register (Ir); Control Register 1 (Lr0) - Renesas F-ZTAT H8 Series Hardware Manual

14. Dot Matrix LCD Controller (H8/3854 Group)
14.2

Register Descriptions

14.2.1

Index Register (IR)

Bit 7
⎯
⎯
Initial value
⎯
Read/Write
IR is an 8-bit write-only register that selects one of the LCD controller's five control registers. IR
is selected when RS is 0.
Upon reset, IR is initialized to H'00.
Bits 7 to 3—Reserved Bits: Bits 7 to 3 are reserved; they should always be cleared to 0.
Bits 2 to 0—Index Register (IR2 to IR0): Bits 2 to 0 are used to select one of the LCD
controller's five control registers. The correspondence between the settings of IR2 to IR0 and the
selected registers is shown in table 14.2. Other settings are invalid.
14.2.2

Control Register 1 (LR0)

Bit 7
⎯
⎯
Initial value
⎯
Read/Write
LR0 is an 8-bit write-only register that performs LCD module standby mode setting and drive duty
selection.
Upon reset, LR0 is initialized to H'00.
Bits 7 and 6—Reserved Bits: Bits 7 and 6 are reserved; they should always be cleared to 0.
Rev.3.00 Jul. 19, 2007 page 378 of 532
REJ09B0397-0300
6 5
⎯ ⎯
⎯ ⎯
⎯ ⎯
6 5
⎯
LSBY
⎯
0
⎯
W
4 3
⎯ ⎯
IR2
⎯ ⎯
⎯ ⎯
4 3
⎯ ⎯
⎯ ⎯
⎯ ⎯
2 1
IR1 IR0
0 0
W W
2 1
⎯
DDTY1
⎯
0
⎯
W
0
0
W
0
⎯
⎯
⎯