Samsung KS57C2308 Manual page 252

LCD CONTROLLER/DRIVER
LCD CONTROL REGISTER (LCON)
The LCD control register (LCON) is used to turn the LCD display on and off, to output LCD clock (LCDCK) and
synchronizing signal (LCDSY) for LCD display expansion, and to control the flow of current to dividing resistors in
the LCD circuit. Following a
the flow of current to the dividing resistors.
The effect of the LCON.0 setting is dependent upon the current setting of LMOD.3.
LCON Bit Setting
LCON.3
LCON.2
LCON.1
LCON.0
LCON.0 LMOD.3
0 –
1 0
1
12-4
, all LCON values are cleared to "0". This turns the LCD display off and stops
RESET
LCON "0"
Table 12-2. LCD Control Register (LCON) Organization
0 This bit is used for internal testing only; always logic zero.
0 Disable LCDCK and LCDSY signal outputs.
1 Enable LCDCK and LCDSY signal outputs.
0 Always logic zero.
0 LCD output low, display off; cut off current to dividing resistor, and output port
8 latch contents.
1 If LMOD.3 = "0":; LCD display off; output port 8 latch contents.
If LMOD.3 = "1": COM and SEG output in display mode; LCD display on.
Table 12-3. LCON.0 and LMOD.3 Bit Settings
COM0–COM3
Output low; LCD display off
LCD display off
COM output corresponds to display
mode
LCON.2 "0"
Description
SEG0–SEG31
Output low;
LCD display off
LCD display off Output latch
SEG output
corresponds to
display mode
KS57C2308/P2308/C2316/P2316
LCON.0 F8EH
P8.0–P8.7
Output latch
contents
contents
Output latch
contents
Cut off current to
dividing resistors
LCD display off
LCD display on