參數(shù)資料
型號: MC68HC05L25PB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52
封裝: TQFP-52
文件頁數(shù): 14/152頁
文件大?。?/td> 897K
代理商: MC68HC05L25PB
LCD Driver
MC68HC05L25 Data Sheet, Rev. 3.1
110
Freescale Semiconductor
11.6 LCD Waveform Base Clock and LCD Cycle Frame
The clock which produces the LCD FP and BP output waveforms, the LCD waveform back clock, is
generated from the time base module.
The frequency for the LCD waveform base clock can be changed by the time base control register.
11.6.1 Time Base Control Register 1
LCLK — LCD Clock
The LCLK bit selects the clock for the LCD driver. This bit is cleared on reset.
When TBCLK = 0:
1 = XOSC divide by 128 is selected for the LCD clock
0 = XOSC divide by 64 is selected for the LCD clock
When TBCLK = 1:
1 = OSC divide by 16,384 is selected for the LCD clock
0 = OSC divide by 8192 is selected for the LCD clock
11.6.2 LCD Cycle Frame
The LCD cycle frame with respect to the LCD waveform base clock and duty is
For example, given 1/3 duty and 256 Hz waveform base clock.
Address:
$0010
Bit 7
654321
Bit 0
Read:
TBCLK
0
LCLK
RMC4
RMC3
RMC2
RMC1
RMC0
Write:
Reset:
00000000
= Unimplemented
Figure 11-14. Time Base Control Register 1 (TBCR1)
Table 11-2. LCD Waveform Base Clock Frequency
TBCR1
Divide Ratio
LCD Waveform Base Clock Frequency (Hz)
(fXOSC = 32.768 kHz)
TBCLK LCLK
OSC = 2.0 MHz
OSC = 4.0 MHz
OSC = 4.1943 MHz
0
XOSC
÷ 64
512
0
1
XOSC
÷ 128
256
10
OSC
÷ 8192
244
488
512
11
OSC
÷ 16384
122
244
256
LCD Cycle Frame
()
1
LCD Waveform Base Clock
() Duty
()
---------------------------------------------------------------------------------------------------
=
LCD Cycle Frame
()
1
256
1
3
---
------------------
=
11.72
=
ms
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