W79E217A Datasheet, PDF (177/207 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E217A Data Sheet
FLCD
COM0
COM1
COM2
VDD
VLCD2
VLCD1
VSS
VDD
VLCD2
VLCD1
VSS
VDD
VLCD2
VLCD1
VSS
1/3 Duty
Figure 20-8: LCD com output pins configured using Voltage Pump B type with 1/3 duty.
20.3 LCD Power Connection
The LCD power connection for 1/3 bias is shown figure below. LCD voltage amplification uses
regulator type. 3 bias voltages; VDD, VLCD2 = 2/3VDD and VLCD1=1/3VDD.
Figure 20-9: 1/3 Bias LCD Power Connection
Example output waveform of LCD driving mode in next diagram.
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Publication Release Date: December 14, 2007
Revision A3.0