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)： 144/156頁
文件大?。?/td> 1107K
代理商： MC68HC08LT8CFGE
Liquid Crystal Display (LCD) Driver
MC68HC08LT8 Data Sheet, Rev. 1
88
Freescale Semiconductor
The voltage waveform across the "e" segment of the LCD (between BP2 and FP0) is illustrated in
Figure 8-15. As shown in the waveform, the voltage peaks do not reach the LCD-ON voltage, VLCD,
therefore, the segment will be OFF.
Figure 8-15. "e" Segment Voltage Waveform
8.8 I/O Registers
Fifteen (15) registers control LCD driver module operation:
LCD control register (LCDCR)
LCD clock register (LCDCLK)
LCD data registers (LDAT1–LDAT13)
8.8.1 LCD Control Register (LCDCR)
The LCD control register (LCDCR):
Enables the LCD driver module
Selects bias resistor value and fast-charge control
Selects LCD contrast
LCDE — LCD Enable
This read/write bit enables the LCD driver module; the backplane and frontplane drive LCD waveforms
out of BPx and FPx pins. Reset clears the LCDE bit.
1 = LCD driver module enabled
0 = LCD driver module disabled
FC — Fast Charge
LC — Low Current
These read/write bits are used to select the value of the resistors in resistor ladder for LCD voltages.
Reset clears the FC and LC bits.
Address:
$0051
Bit 7
654321
Bit 0
Read:
LCDE
0
FC
LC
LCCON3
LCCON2
LCCON1
LCCON0
Write:
Reset:
00000000
= Unimplemented
Figure 8-16. LCD Control Register (LCDCR)
+VLCD1
+VLCD2
–VLCD2
–VLCD1
–VLCD
+VLCD
0
BP2–FP0
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