Control Register 2 (Lr1) - Renesas F-ZTAT H8 Series Hardware Manual

13.2.3

Control Register 2 (LR1)

Bit
7
⎯
⎯
Initial value
⎯
Read/Write
LR1 is an 8-bit write-only register that selects operation or halting of LCD display and the op-amp
circuits, performs read-modify-write mode setting, and selects the address to be incremented in the
display memory.
Upon reset, LR1 is initialized to H'00.
Bit 7—Reserved Bit: Bit 7 is reserved; it should always be cleared to 0.
Bit 6—LCD Operation Setting (DISP): Bit 6 selects operation or halting of the LCD display.
When the LSBY bit in LR0 is set to 1, DISP is cleared.
Bit 6: DISP Description
0 LCD is turned off. All LCD outputs go to the V
1 LCD is turned on
Bit 5—Reserved Bit: Bit 5 is reserved; it should always be cleared to 0.
Bit 4—Op-Amp Circuit Operation Setting (OPON): Bit 4 selects operation or halting of the op-
amp circuits. When the LCD drive power supply level is applied to V1OUT to V5OUT from an
external source, OPON must be cleared to 0.
When the LSBY bit in LR0 is set to 1, OPON is cleared.
Bit 4: OPON Description
0 Built-in op-amps are halted, and output becomes high-impedance. LCD drive
voltage can be input from external source
1 Built-in op-amps operate
6 5
⎯
DISP OPON
⎯
0
⎯
W
13. Dot Matrix LCD Controller (H8/3857 Group)
4 3
⎯
RMW
⎯
0 0
⎯
W W
level
SS
Rev.3.00 Jul. 19, 2007 page 333 of 532
2 1
INC BLK
0
W W
(initial value)
(initial value)
REJ09B0397-0300
0
0