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參數資料
型號: W742C810
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-BIT MICROCONTROLLER
中文描述: 4-BIT, MROM, 3.58 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 20 MM, 2.75 MM HEIGHT, QFP-100
文件頁數: 31/42頁
文件大小: 501K
代理商: W742C810
Preliminary W742C810
Publication Release Date: May 1999
- 31 -
Revision A1
The LCDON instruction turns on the LCD display (even in HOLD mode), and the LCDOFF instruction
turns off the LCD display. At initial reset, all the LCD segments are unlit. When the initial reset state
ends, the LCD display is turned off automatically. To turn on the LCD display, the instruction LCDON
must be executed.
6.22.1 LCD RAM addressing method
There are 40 LCD RAMs (LCDR00 - LCDR27) that should be indirectly addressed. The LCD RAM
pointer (LP) is used to point to the address of the wanted LCD RAM. The LP is organized as 6-bit
binary register. The MOV LPL,R and MOV LPH,R instructions can load the LCD RAM address to the
LP from R. The MOV @LP,R and MOV R,@LP instructions can access the pointed LCD RAM
content.
6.22.2 The output waveforms for the LCD driving mode
1/3 bias 1/4 duty Lighting System (Example)
Normal Operating Mode
COM0
VDD2
VDD1
VSS
VDD
VDD2
VDD1
VSS
VDD
COM1
COM2
VDD2
VDD1
VSS
VDD
VDD2
VDD1
VSS
VDD
COM3
VDD2
VDD1
VSS
VDD
VDD2
VDD1
VSS
VDD
LCD driver
outputs for
only seg. on
COM0 side
being lit
LCD driver
outputs for
only seg. on
COM1 side
being lit
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