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參數(shù)資料
| 型號： | UPD753304W |
| 廠商： | NEC Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機的小型通用紅外遙控器 |
| 文件頁數(shù)： | 24/56頁 |
| 文件大?。?/td> | 374K |
| 代理商： | UPD753304W |
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24
μ
PD753304
6.7 LCD Controller/Driver
The
μ
PD753304 incorporates a display controller which generates segment and common signals according to
the display data memory contents and incorporates segment and common drivers which can drive the LCD panel
directly.
The
μ
PD753304 LCD controller/driver has the following functions:
Display data memory is read automatically by DMA operation and segment and common signals are
generated.
Display mode can be selected from among the following five:
<1> Static
<2> 1/2 duty (time multiplexing by 2), 1/2 bias
<3> 1/3 duty (time multiplexing by 3), 1/2 bias
<4> 1/3 duty (time multiplexing by 3), 1/3 bias
<5> 1/4 duty (time multiplexing by 4), 1/3 bias
A frame frequency can be selected from among four in each display mode.
A maximum of 24 segment signal output pins (S0 to S23) and four common signal output pins (COM0 to
COM3).
The segment signal output pins (S20 to S23) can be changed to the I/O ports (PORT8).
LCD display modes can be selected (mask option).
It can also operate by using the subsystem clock.
Figure 6-6. LCD Controller/Driver Block Diagram
Port 8
output latch
register group C
0
selection
register
Decoder
1F7H
3 2 1 0
1F4H
3 2 1 0
1F3H
3 2 1 0
1E0H
3 2 1 0
3 2 1 0
3 2 1 0 3 2 1 0
3 2 1 0
Display mode register
Display
control
register
Timing
controller
Segment driver
Segment driver
Common driver
LCD drive
voltage control
3
Port 8
Input/Output buffer
S23/P80
S20/P83
S19
S0
COM3 COM2 COM1COM0
f
LCD
4
4
8
4
4
8
4
Internal bus
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