參數(shù)資料
型號: MC68HC705PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 3/165頁
文件大?。?/td> 841K
代理商: MC68HC705PD6
GENERAL RELEASE SPECIFICATION
July 7, 1997
MOTOROLA
LCD DRIVER
MC68HC05PD6
10-4
REV 1.1
10.2
VLCD3 BIAS INPUT & BIAS RESISTORS
VLCD3 is the bias input for the MC68HC(7)05PD6 LCD module. The highest level
of the output waveform is VDD voltage and the lower three levels are VLCD1,
VLCD2 and VLCD3. VLCD3 is externally driven, while the other reference
voltages, VLCD1 and VLCD2, are internally generated.
The MC68HC(7)05PD6 LCD module has software selectable internal bias
resistors RLCD1, RLCD2 and RLCD3 which form a resistor ladder. This ladder is
used to generate VLCD1, VLCD2 and VLCD3. The resistors are arranged such
that VDD>VLCD1>VLCD2>VLCD3. Bias voltages may be adjusted using these
internal resistors. Three possible values may be selected for these resistors using
the FC and LC bits in the LCD Control Register at $0020. A contrast resistor, RV,
as illustrated in Figure 10-3, may be placed between VDD and VSS.
Figure 10-3. Simplied LCD Voltage Divider Schematic
VDD
VLCD3
RLCD1
RLCD2
RLCD3
VDD
VLCD1
VLCD2
VLCD3
RV
MCU
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