參數(shù)資料
型號: MC68HC08LT8CFGE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP44
封裝: 10 X 10 MM, 1.40 MM THICKNESS, 0.80 MM PITCH, ROHS COMPLIANT, MS-026BCB, LQFP-44
文件頁數(shù): 132/156頁
文件大?。?/td> 1107K
代理商: MC68HC08LT8CFGE
Functional Description
MC68HC08LT8 Data Sheet, Rev. 1
Freescale Semiconductor
77
8.4 Functional Description
Figure 8-2 shows a block diagram of the LCD driver module, and Figure 8-3 shows a simplified schematic
of the LCD system.
The LCD driver module uses a 1/3 biasing method. The LCD power is supplied by the VLCD pin. Voltages
VLCD1, VLCD2, and VLCD3 are generated by an internal resistor ladder.
The LCD data registers, LDAT1–LDAT13, control the LCD segments’ ON/OFF, with each data register
controlling two frontplanes. When a logic 1 is written to a FxBx bit in the data register, the corresponding
frontplane-backplane segment will turn ON. When a logic 0 is written, the segment will turn OFF.
When the LCD driver module is disabled (LCDE = 0), the LCD display will be OFF, all backplane and
frontplane drivers have the same potential as VDD. The resistor ladder is disconnected from VDD to reduce
power consumption.
Figure 8-2. LCD Block Diagram
LCD FRONTPLANE DRIVER AND DATA LATCH
POR
T
-C
LOGIC
BACKPLANE
DR
IVER
LCDE (LCDCR)
STATE
CONTROL
1/4
1/3
1/4
1/1
PTC5/FP24
PTC4/FP23
PTC3/FP22
PTC2/FP21
PTC1/FP20
PTC0/FP19
P
T
D0/FP11
P
T
D1/FP12
P
T
D2/FP13
P
T
D3/FP14
P
T
D4/FP15
P
T
D5/FP16
P
T
D6/FP17
P
T
D7/FP18
BP0
BP1
BP2
FP0/BP3
PTB6/FP1
PTB7/FP2
INTERN
AL
BU
S
PORT-D LOGIC
POR
T
-B
LOGI
C
P
T
E0/FP3
P
T
E1/FP4
P
T
E2/FP5
P
T
E3/FP6
P
T
E4/FP7
P
T
E5/FP8
P
T
E6/FP9
P
T
E7/FP10
PORT-E LOGIC
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