Samsung 8-Bit CMOS Microcontroller, S3C9228/P9228 user manual Lmod LCD Mode Control Register

S3C9228/P9228CONTROL REGISTERS

LMOD — LCD Mode Control Register FEH

Bit Identifier

RESET Value

Read/Write

.7

.6

.7	.6	.5	.4	.3	.2	.1	.0
–	0	0	0	0	0	0	0
–	R/W	R/W	R/W	R/W	R/W	R/W	R/W

Not used for S3C9228/P9228

COM Pins High Impedance Control Bit

0Normal COMs signal output

1COM pins are at high impedance

.5 Port3 High Impedance Control Bit

0Normal I/O

1High impedance input

.4 LCD Display Control Bit

0Display off (cut off the LCD voltage dividing resistors)

1Normal display on

.3-.2	LCD Duty and Bias Selection Bits
	0	0	1/3 duty, 1/3 bias; COM0–COM2/SEG0–SEG19
	0	1	1/4 duty, 1/3 bias; COM0–COM3/SEG0–SEG19
	1	0	1/8 duty, 1/4 bias; COM0–COM7/SEG0–SEG15
	1	1	1/8 duty, 1/5 bias; COM0–COM7/SEG0–SEG15

.1-.0	LCD Clock Selection Bits
	0	0	fw/27	(256 Hz when fw is 32.768 kHz)
	0	1	fw/26	(512 Hz when fw is 32.768 kHz)
	1	0	fw/25	(1,024 Hz when fw is 32.768 kHz)
	1	1	fw/24	(2,048 Hz when fw is 32.768 kHz)

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