Precautions - Epson S1C63003 Technical Manual

STCD: lCD drive switch register (FF51h•D3)
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."
Note: The static drive function uses all COM outputs (COM0 to COM7*) even if a duty other than 1/8 (1/5
in the S1C63003) is selected. Hence, for static drive, set the same value for all display memory
corresponding to COM0 to COM7*. (* COM0 to COM4 in the S1C63003)
lC[3:0]: lCD contrast adjustment register (FF52h) – S1C63004/008/016
Adjusts the LCD contrast.
LC[3:0] = 0H light
: :
LC[3:0] = FH dark
When the LCD drive voltage is supplied from outside by mask option selection, this adjustment becomes invalid.
At initial reset, this register is set to 0.
14.6

Precautions

• Make sure the LCD display is off (LPWR = "0") before setting the frame frequency. If the frame frequency is
switched when the LCD display is on (LPWR = "1"), the LCD may not display normally for one frame period after
switching.
• The frame frequency affects the display quality. We recommend that the frame frequency should be determined
after the display quality is evaluated using the actual LCD panel.
• At initial reset, the contents of display memory are undefined and LC[3:0] (LCD contrast) is set to "0," therefore,
it is necessary to initialize those contents by software. Also note that the LPWR and DSPC[1:0] registers are set to
turn the display off.
• When Pxx (P20 to P53) and R/F converter terminals are used as the segment terminals by selecting mask option,
do not alter the Pxx port and R/F converter control registers that affect these terminals from their initial values.
S1C63003/004/008/016 TeChniCal Manual
(Rev. 1.1)
Seiko epson Corporation
14 lCD DRiVeR
14-17