S1C63358 TECHNICAL MANUAL
EPSON
63
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
STCD: Common output signal control register (FF61H•D0)
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 goes 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 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".
Display memory (F000H–F01FH)
The LCD segments are lit or turned off depending on this data.
When "1" is written: Lit
When "0" is written: Not lit
Reading: Invalid
By writing data into the display memory allocated to the LCD segment (on the panel), the segment can be
lit or put out.
At initial reset, the contents of the display memory are undefined, therefore it is necessary to initialize by
software. Since the display memory permits reading and writing, the addresses/bits that are not used on
the LCD display can be used as general-purpose registers.
4.8.6 Programming notes
(1) The contents of the display memory are undefined until the area is initialized (through, for instance,
memory clear processing by the CPU). Initialize the display memory by executing initial processing.
(2) 100 msec or more time is necessary for stabilizing the LCD drive voltages V
C1
, V
C2
and V
C3
after
setting the LCD power control register LPWR to "1". Be careful of the segment-on right after the
power is turned on.
