SyncMOS Technologies International. Inc.
SM79108
7. LCD Driver
SM79108 incorporates an on-chip LCD driver which generates segment and common signals output according to the dis-
play data saved in LCD buffer registers (0E1H~0E7H) and incorporates segment and common drivers which can drive the
LCD panel directly.
The on chip LCD Driver has the following features:
1/4 duty (time multiplexing by 4) and 1/3 bias LCD segment driver
0.88 mA operation current (1.2 uA in power down mode)
56 bits of display data buffer
14 segment driver and 4 common driver outputs
A frames frequency can be selected
7.1 LCD Control register (LCDCON, 0DFH)
bit-7
LCD_ON
R/W
bit-0
LS0
R/W
0
LCD_EN
R/W
SEG
R/W
0
Unused
Unused
LS2
R/W
0
LS1
R/W
0
Read /Write:
Reset value:
-
-
0
0
*
*
LCDCON7~LCDCON0: LCD control register is used to control LCD driver operation
LCD_ON: LCD display bit
= 1:LCD display ON
= 0:LCD display OFF
LCD_EN: LCD enable bit
SEG: = 1:enables the LCD function on pin #PSEN/SEG4 and ALE/SEG5
= 0:no operation
LS[2:0]: Frequency prescaler select, determine the clock frequency of LCD driver, Fclk_lcd
LS2
0
LS1
0
LS0
0
PRESCALER SELECT
1
2
0
0
1
1
0
4
0
1
1
1
1
1
1
8
0
0
16
32
64
128
0
1
1
0
1
1
Specifications subject to change without notice,contact your sales representatives for the most recent information.
15/26
Ver 2.1 SM79108 08/2006
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
