Epson S1C63454 Technical Manual page 58

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
VCCHG: LCD regulated voltage switching register (FF60H•D1)
Selects the reference voltage for the LCD drive voltage.
When "1" is written: V
When "0" is written: V
Reading: Valid
When "1" is written to the VCCHG register, the LCD system voltage circuit generates the LCD drive
voltage as V standard. When "0" is written, it becomes V
C2
voltage is 2.6 V or more, otherwise, select V
When external power mode is selected by the mask option, this control is unnecessary.
At initial reset, this register is set to "0".
LDUTY0, LDUTY1: LCD drive duty switching register (FF60H•D2, D3)
Selects the LCD drive duty.
LDUTY1
1
0
0
At initial reset, this register is set to "0".
ALON: LCD all ON control register (FF61H•D1)
Displays the all LCD dots ON.
When "1" is written: All LCD dots displayed
When "0" is written: Normal display
Reading: Valid
By writing "1" to the ALON register, all the LCD dots goes ON, and when "0" is written, it returns to
normal display.
This function outputs an ON waveform to the SEG terminals, and does not affect the content of the
display memory.
ALON has priority over ALOFF.
At initial reset, this register is set to "0".
ALOFF: LCD all OFF control register (FF61H•D2)
Fade outs the all LCD dots.
When "1" is written: All LCD dots fade out
When "0" is written: Normal display
Reading: Valid
By writing "1" to the ALOFF register, all the LCD dots goes OFF, and when "0" is written, it returns to
normal display.
This function outputs an OFF waveform to the SEG terminals, and does not affect the content of the
display memory.
At initial reset, this register is set to "1".
48
C2
C1
.
C1
Table 4.7.7.2 Drive duty setting
LDUTY0 Drive duty Common terminal used
∗
1/8
1 1/16
0 1/17
standard. Select V
C1
Maximum segment number
COM0–COM7
COM0–COM15
COM0–COM16
EPSON
when power supply
C2
320 (40 × 8)
640 (40 × 16)
680 (40 × 17)
S1C63454 TECHNICAL MANUAL