Blink End Line Register (Lr9); Contrast Control Register (Lra) - Renesas F-ZTAT H8 Series Hardware Manual

13. Dot Matrix LCD Controller (H8/3857 Group)
The possible settings are 0 to 31 for 1/32 duty, 0 to 15 for 1/16 duty, and 0 to 7 for 1/8 duty.
Normal operation is not guaranteed if these ranges are exceeded.

13.2.10 Blink End Line Register (LR9)

Bit
7
⎯
⎯
Initial value
⎯
Read/Write
LR9 is an 8-bit write-only register that specifies the end line of an area made to blink.
Upon reset, LR9 is initialized to H'00.
Bits 7 to 5—Reserved Bits: Bits 7 to 5 are reserved; they should always be cleared to 0.
Bits 4 to 0—Blink End Line Setting (BEL4 to BEL0): Bits 4 to 0 specify the end line of an area
made to blink. Set a value of [blink end line – 1].
The possible settings are 0 to 31 for 1/32 duty, 0 to 15 for 1/16 duty, and 0 to 7 for 1/8 duty.
Normal operation is not guaranteed if these ranges are exceeded.

13.2.11 Contrast Control Register (LRA)

Bit 7
⎯
⎯
Initial value
⎯
Read/Write
LRA is an 8-bit write-only register that specifies the contrast control resistance value.
Upon reset, LRA 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 340 of 532
REJ09B0397-0300
6 5
⎯ ⎯
BEL4
⎯ ⎯
⎯ ⎯
6 5
⎯ ⎯ ⎯
⎯ ⎯ ⎯
⎯ ⎯ ⎯
4 3
BEL3 BEL2
0 0
W W W
4 3
CCR3 CCR2
0
W W
2 1
BEL1 BEL0
0 0
W W
2 1
CCR1 CCR0
0 0
W W
0
0
0
0