Programming Notes - Epson S1C63454 Technical Manual

LPAGE: LCD display memory selection register (FF61H•D0)
Selects the display memory area at 1/8 duty drive.
When "1" is written: F100H–F14FH
When "0" is written: F000H–F04FH
Reading: Valid
By writing "1" to the LPAGE register, the data set in F100H–F14FH (the second half of the display
memory) is displayed, and when "0" is written, the data set in F000H–F04FH (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.
When the LCD drive voltage is supplied from outside by the mask option selection, this adjustment
becomes invalid.
At initial reset, LC0–LC3 are undefined.

4.7.8 Programming notes

(1) When a program that access no memory mounted area (F050H–F0FFH, F150H–F1FFH, F201H, F203H,
· · ·, F24FH) is made, the operation is not guaranteed.
(2) Because at initial reset, the contents of display memory and LC3–LC0 (LCD contrast) are undefined,
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.
S1C63454 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
EPSON
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