參數(shù)資料
型號(hào): MC68HC08LT8
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁(yè)數(shù): 80/156頁(yè)
文件大小: 1030K
代理商: MC68HC08LT8
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Liquid Crystal Display (LCD) Driver
MC68HC08LT8 Data Sheet, Rev. 1
80
Freescale Semiconductor
Figure 8-4. Fast Charge Timing
8.4.5 Contrast Control
The contrast of the connected LCD panel can be adjusted by configuring the LCCON[3:0] bits in the LCD
control register. The LCCON[3:0] bits provide a 16-step contrast control, which adjusts the bias voltage
in the resistor ladder for LCD voltage, V
LCD3
. The relative voltages, V
LCD1
and V
LCD2
, are altered
accordingly. For example, setting LCCON[3:0] = $F, the relative panel potential voltage (V
LCD
– V
LCD3
)
is reduced from maximum 3.3V to approximate 2.45V.
8.5 Low-Power Modes
The STOP and WAIT instructions put the MCU in low power-consumption standby modes.
8.5.1 Wait Mode
The LCD driver module continues normal operation in wait mode. If the LCD is not required in wait mode,
power down the LCD module by clearing the LCDE bit before executing the WAIT instruction.
8.5.2 Stop Mode
For continuous LCD module operation in stop mode, the oscillator stop mode enable bit (STOP_XTALEN
in CONFIG2 register) must be set before executing the STOP instruction. When STOP_XTALEN is set,
32KXCLK continues to drive the LCD module.
If STOP_XTALEN bit is cleared, the LCD module is inactive after the execution of a STOP instruction.
The STOP instruction does not affect LCD register states. LCD module operation resumes after an
external interrupt. To further reduce power consumption, the LCD module should be powered-down by
clearing the LCDE bit before executing the STOP instruction.
LCD WAVEFORM
EXAMPLE: BP0
FAST CHARGE CLOCK
LCDCLK
HIGH CURRENT SELECTED BEFORE SWITCHING EDGE,
PERIOD IS DEFINED BY FCCTL[1:0]
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