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EPSON
S1C63656 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
STCD: LCD drive switch register (FF60H•D1)
Switches the LCD driving method.
When "1" is written: Static drive
When "0" is written: Dynamic drive
Reading: Valid
By writing "1" to STCD, static drive is selected, and dynamic drive is selected when "0" is written.
At initial reset, this register is set to "0".
ALON: LCD all on control register (FF61H•D1)
Displays the all LCD segments on.
When "1" is written: All LCD segments displayed
When "0" is written: Normal display
Reading: Valid
By writing "1" to the ALON register, all the LCD segments go on, and when "0" is written, it returns to
normal display. This function outputs an on waveform to the SEG terminals, and segments 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 segments.
When "1" is written: All LCD segments fade out
When "0" is written: Normal display
Reading: Valid
By writing "1" to the ALOFF register, all the LCD segments go 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.
ALON (FF61H•D1) has priority over ALOFF, so all the LCD segments go on when ALON and ALOFF are
set to "1" simultaneously.
At initial reset, this register is set to "1".
LC3–LC0: LCD contrast adjustment register (FF62H)
Adjusts the LCD contrast.
LC3–LC0 = 0000B
light
:
:
LC3–LC0 = 1111B
dark
When the LCD drive voltage is supplied from outside by mask option selection, this adjustment becomes
invalid. Furthermore, the contrast adjustment function cannot be used when "Internal power supply
(low-power mode)" is selected. Setting of this register is ignored.
At initial reset, LC0–LC3 is set to 0000B.
4.7.8 Programming note
Because at initial reset, the contents of display memory are undefined and LC3–LC0 (LCD contrast) is set
to 0000B, there is need to initialize by the software. Furthermore, take care of the registers LPWR and
ALOFF because these are set so that the display goes off.
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