
S1C6F567 TECHNICAL MANUAL
EPSON
51
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
LDUTY0, LDUTY1: LCD drive duty switching register (FF60HD2, D3)
Selects the LCD drive duty.
Table 4.7.6.2 Drive duty setting
LDUTY1
1
0
LDUTY0
1
0
Drive duty
1/8
1/16
1/17
Common terminal used
COM0–COM7
COM0–COM15
COM0–COM16
Maximum segment number
480 (60
× 8)
960 (60
× 16)
1,020 (60
× 17)
At initial reset, this register is set to "0".
ALON: LCD all ON control register (FF61HD1)
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 (FF61HD2)
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".
LPAGE: LCD display memory selection register (FF61HD0)
Selects the display memory area at 1/8 duty drive.
When "1" is written: F100H–F177H
When "0" is written: F000H–F077H
Reading: Valid
By writing "1" to the LPAGE register, the data set in F100H–F177H (the second half of the display
memory) is displayed, and when "0" is written, the data set in F000H–F077H (the first half of the display
memory) is displayed.
This function is valid only when 1/8 duty is selected, and when 1/16 or 1/17 duty is selected, this
register can be used as a general purpose register.
At initial reset, this register is set to "0".
LC3–LC0: LCD contrast adjustment register (FF62H)
Adjusts the LCD contrast.
LC3–LC0 = 0000B
light
::
LC3–LC0 = 1111B
dark
At room temperature, use setting number 7 or 8 as standard.
At initial reset, LC3–LC0 are undefined.