s3c72m9 Samsung Semiconductor, Inc., s3c72m9 Datasheet - Page 316

• Manufacturer Part Number: s3c72m9
• Description: The S3c72m5/s3c72m7/s3c72m9 Single-chip Cmos Microcontroller Has Been Designed For High Performance Using Samsung S
• Manufacturer: Samsung Semiconductor, Inc.

LCD CONTROLLER/DRIVER
LCD CONTRAST CONTROL REGISTER (LCNST)
The LCD contrast control register (LCNST) is used to control the LCD contrast up to 16 step contrast level. Following
a RESET, all LCNST values are cleared to "0". This disable the LCD contrast control.
LCD Contrast Control Enable/Disable Bit
NOTE:
Bits 6–4
Segment/Port Output Selection Bits
NOTE:
12-8
LCNST.3
F8AH
F8BH
LCNST.7
0
0
0
0
0
1
Bits 6–4
You can't control LCD contrast by software when the V
when you use internal V
V
LCD
0
1
= V
LCNST.3
LCNST.7
LCNST.2
DD
0
0
0
0
1
1
(n+17)/32, n = 0, 1, …….,15.
Table 12-6. LCD Contrast Control Register (LCNST) Organization
LCNST.2
LCNST.1
DD
0
for V
0
0
1
1
0
1
LCD
voltage, you can control LCD contrast by software.
LCNST.1
LCNST.0
0
0
1
0
1
0
1
Enable/Disable LCD Contrast Control
Disable LCD contrast control
Enable LCD contrast control
LCNST.0
LCD
Always logic zero
0
voltage is supplied by external voltage source. Only
S3C72M5/C72M7/C72M9/P72M9 (Preliminary Spec)
16/16 step (The brightest level)
1/16 step (The dimmest level)
16 Step Contrast Level
2/16 step
3/16 step
4/16 step
4/16 step