815
LCD Controller/Driver (LCD-C/D)
Chapter 22
Preliminary User’s Manual U17566EE1V2UM00
(2)
LCDM0 - LCD mode control register
The 8-bit LCDM0 register enables/disables the LCD operation, activates edge
enhancement and selects the power supply.
Access
This register can be read/written in 8-bit or 1-bit units.
Address
FFFF FB01
H
Initial Value
00
H
. This register is cleared by any reset.
Caution
Bits 0, 1, 2, 3, 5, 6 must always be 0.
(3)
SEGREG0k - LCD display control register (k = 0 to 39)
The 8-bit registers contain the data that is displayed on the LCD. Each register
contains the data for one of the 40 segments.
Access
These registers can be read/written in 8-bit or 1-bit units.
Address
FFFF FB20
H
to FFFF FB47
H
Initial Value
00
H
. This register is cleared by any reset.
The bits 4 to 7 are ignored. They should be set to zero.
7
6
5
4
3
2
1
0
LCDON0
0
0
LIPS0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Table 22-6
LCDM0 register contents
Bit position
Bit name
Function
7
LCDON0
Enables/disables LCD display
0: Display disabled
No segment of the display is visible. The contents of the SEGREG0k
registers are disregarded. The output is at non-selection level.
1: Display enabled
4
LIPS0
Selects the power supply
0: LCD Controller/Driver is not powered
1: LCD Controller/Driver is powered
7
6
5
4
3
2
1
0
0
0
0
0
DATA
R/W
Table 22-7
SEGREG0k register contents (k = 0 to 39)
Bit position
Bit name
Function
3 to 0
SEGREG0k[3:0]
Status of the LCD segment that is controlled by segment signal k and the
common signal, that corresponds to the bit position.
0: Display off
1: Display on, if corresponding common signal is active
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