mc68hc05l25 Freescale Semiconductor, Inc, mc68hc05l25 Datasheet - Page 110

• Manufacturer Part Number: mc68hc05l25
• Description: M68hc05 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

LCD Driver
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
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.
110
The LCLK bit selects the clock for the LCD driver. This bit is cleared on reset.
When TBCLK = 0:
When TBCLK = 1:
1 = XOSC divide by 128 is selected for the LCD clock
0 = XOSC divide by 64 is selected for the LCD clock
1 = OSC divide by 16,384 is selected for the LCD clock
0 = OSC divide by 8192 is selected for the LCD clock
TBCLK LCLK
Address:
Reset:
Read:
Write:
0
0
1
1
TBCR1
TBCLK
$0010
0
1
0
1
Bit 7
Figure 11-14. Time Base Control Register 1 (TBCR1)
0
Table 11-2. LCD Waveform Base Clock Frequency
(
LCD Cycle Frame
OSC ÷ 16384
Divide Ratio
XOSC ÷ 128
OSC ÷ 8192
XOSC ÷ 64
= Unimplemented
6
0
0
MC68HC05L25 Data Sheet, Rev. 3.1
(
LCD Cycle Frame
LCLK
OSC = 2.0 MHz
)
5
0
=
-------------------------------------------------------------------------------------------------- -
(
512
256
244
122
LCD Waveform Base Clock Frequency (Hz)
LCD Waveform Base Clock
RMC4
4
0
)
=
=
(f
----------------- -
256
OSC = 4.0 MHz
11.72
XOSC
RMC3
1
3
0
⋅
1
1
-- -
3
512
256
488
244
= 32.768 kHz)
ms
RMC2
2
0
)
⋅
(
Duty
OSC = 4.1943 MHz
)
RMC1
1
0
512
256
512
256
Freescale Semiconductor
RMC0
Bit 0
0