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23 lCD DRiVeR (lCD)
Selects which of the two display areas reserved in the display memory is displayed when driving the
LCD in 1/4, 1/3, 1/2 duty or static drive. Setting DSPAR to 0 selects display area 0; setting to 1 selects
display area 1. See Figures 23.5.1 to 23.5.10 for the display areas.
D4
DSPReV: Reverse Display Control Bit
Inverts (negative display) the LCD display.
1 (R/W): Normal display (default)
0 (R/W): Inverted display
Setting DSPREV to 0 inverts the LCD panel display; setting to 1 returns the display to normal status.
This operation does not affect the contents of the display memory.
D[3:2]
Reserved
D[1:0]
DSPC[1:0]: lCD Display Control Bits
Controls the LCD display.
For normal display, set DSPC[1:0] to 0x1. Note that the clock must be supplied. (See Section 23.3.)
If "Display off" is selected, the drive voltage supplied from the LCD system voltage regulator stops,
and the V
to V
C1
Since "All on" and "All off" directly control the driving waveform output by the LCD driver, display
memory data is not altered. COM pins are set to dynamic drive for "All on" and to static drive for "All
off." This function can be used to make the display flash on and off without altering the display memo-
ry.
DSPC[1:0] is reset to 0x0 (Display off) after an initial reset. DSPC[1:0] is also reset to 0x0 when the
slp instruction is executed and it reverts to the previous setting after SLEEP mode is canceled.
lCD Contrast adjustment Register (lCD_CaDJ)
Register name address
Bit
lCD Contrast
0x50a1
D7–4 –
adjustment
(8 bits)
D3–0 lC[3:0]
Register
(lCD_CaDJ)
D[7:4]
Reserved
D[3:0]
lC[3:0]: lCD Contrast adjustment Bits
Adjusts the LCD contrast by controlling voltages V
regulator.
LC[3:0] is set to 0x7 after an initial reset. Initialization via software is required to achieve the required
contrast.
23-16
Table 23.
8.3 LCD Display Control
DSPC[1:0]
0x3
0x2
0x1
0x0
pins are all set to V
level.
C3
SS
name
Function
reserved
LCD contrast adjustment
Table 23.
8.4 LCD Contrast Adjustment
lC[3:0]
0xf
0xe
:
0x1
0x0
Seiko epson Corporation
lCD display
All off (static)
All on (dynamic)
Normal display
Display off
(Default: 0x0)
Setting
–
LC[3:0]
Display
0xf
Dark
:
:
0x0
Light
to V
output by the internal LCD system voltage
C1
C3
Contrast
High (dark)
↑
:
↓
Low (light)
(Default: 0x7)
S1C17624/604/622/602/621 TeChniCal Manual
init. R/W
Remarks
–
–
0 when being read.
0x7 R/W
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