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120 EPSON S1C88650 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (LCD Driver)
5.11.6 Display control
The display status of the built-in LCD driver and
the contrast adjustment can be controlled with the
built-in LCD driver. The LCD display status can be
selected by display control registers LCDC0 and
LCDC1. Setting the value and display status are
shown in Table 5.11.6.1.
Table 5.11.6.1 LCD display control
LCDC1 LCDC0 LCD display
1
1
0
0
1
0
1
0
All LCDs lit (Static)
All LCDs out (Dynamic)
Normal display
Drive OFF
All the dots in the LCD display can be turned on or
off directly by the drive waveform output from the
LCD driver, and data in the display memory is not
changed. Also, since the common terminal at this
time is set to static drive when all the dots are on
and is set to dynamic drive when they are off, this
function can be used as follows:
(1) Since all dots on is binary output (V
C5 and VSS)
with static drive, the common/segment termi-
nal can be used as a monitor terminal for the
OSC1 oscillation frequency adjustment.
(2) Since all dots off is dynamic drive, you can
brink the entire LCD display without changing
display memory data.
Selecting LCD drive OFF turns the LCD drive
power circuit OFF and all the VC1 to VC5 terminals
go to VSS level.
Furthermore, when the SLP instruction is executed,
registers LCDC0 and LCDC1 are automatically
reset to "0" (set to drive off) by hardware.
The LCD contrast can be adjusted in 16 stages. This
adjustment is done by the contrast adjustment
register LC0–LC3, and the setting values corre-
spond to the contrast as shown in Table 5.11.6.2.
Table 5.11.6.2 LCD contrast adjustment
LC3 LC0 Contrast
1
1
1
:
0
0
0
1
0
1
:
0
1
0
Dark
Light
LC1
1
1
0
:
1
0
0
LC2
1
1
1
:
0
0
0
↑
↓