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56 EPSON S1C63558 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
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 40 × 17 is selected), F100H–F15FH (when 48 × 8 is selected)
When "0" is written: F000H–F04FH (when 40 × 17 is selected), F000H–F05FH (when 48 × 8 is selected)
Reading: Valid
By writing "1" to the LPAGE register, the data set in F100H–F14FH/F15FH (the second half of the display
memory) is displayed, and when "0" is written, the data set in F000H–F04FH/F05FH (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.
4.7.8 Programming notes
(1) When a program that access no memory mounted area (F060H–F0FFH, F160H–F1FFH, F201H, F203H,
· · ·, F25FH) 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.
(3) The COM8–COM16 terminals can be set as the SEG47–SEG40 terminals by mask option. In this case,
only 1/8 drive duty can be selected, so a dot matrix type LCD with a maximum of 384 (48 × 8) dots
can be driven. When 48 segments × 8 commons is selected, COM terminals change to SEG terminals
as follows:
COM16 → SEG40 COM15 → SEG41 COM14 → SEG42 COM13 → SEG43 COM12 → SEG44
COM11 → SEG45 COM10 → SEG46 COM9 → SEG47 COM8 → SEG47
This option is valid on the PRC board, however, the SEG47–SEG40 terminals are separately provided.
Therefore, be aware that the COM8–COM16 terminals cannot be changed to the SEG47–SEG40.