HD404629R Datasheet, PDF (108/157 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a DTMF Generator Circuit

HD404629R Series
LCD Control Register (LCR: $01B): Three-bit write-only register which controls LCD blanking, on/off
switching of the liquid-crystal display’s power supply division resistor, and display in watch and subactive
modes, as shown in figure 96.
• Blank/display
Blank: Segment signals are turned off, regardless of LCD RAM data setting.
Display: LCD RAM data is output as segment signals.
• Power switch on/off
Off: The power switch is off.
On: The power switch is on and V1 is VCC.
• Watch/subactive mode display
Off: In watch and subactive modes, all common and segment pins are grounded and the liquid-crystal
power switch is turned off.
On: In watch and subactive modes, LCD RAM data is output as segment signals.
LCD display control register (LCR: $01B)
Bit
Initial value
Read/Write
Bit name
3
—
—
Not used
2
0
W
LCR2
1
0
W
LCR1
0
0
W
LCR0
LCR2
Display on/off selection in
watch and subactive modes
0
Off
1
On
LCR1
0
1
Power switch on/off
Off
On
LCR0
0
1
Blank/display
Blank
Display
Figure 96 LCD Control Register (LCR)
106