Samsung S3C9228/P9228 Manual Do Utilizador
S3C9228/P9228
LCD CONTROLLER/DRIVER
13-3
LCD RAM ADDRESS AREA
RAM addresses of page 1 are used as LCD data memory. When the bit value of a display segment is "1", the
LCD display is turned on; when the bit value is "0", the display is turned off.
LCD display is turned on; when the bit value is "0", the display is turned off.
Display RAM data are sent out through segment pins SEG0–SEG19 using a direct memory access (DMA)
method that is synchronized with the f
method that is synchronized with the f
LCD
signal. RAM addresses in this location that are not used for LCD
display can be allocated to general-purpose use.
COM0
COM1
COM2
COM3
b0
b1
b2
b3
b4
b5
b6
b7
SEG0
COM7
COM6
COM5
COM4
SEG1 SEG2 SEG3
100H 101H 102H 103H
111H 112H 113H
SEG17 SEG18 SEG19
Figure 13-3. LCD Display Data RAM Organization
Table 13-1. Common and Segment Pins per Duty Cycle
Duty
Common Pins
Segment Pins
Dot Number
1/8
COM0–COM7
16 pins
128 dots
1/4
COM0–COM3
20 pins
80 dots
1/3
COM0–COM2
20 pins
60 dots