sc9s12hy64j0vllr Freescale Semiconductor, Inc, sc9s12hy64j0vllr Datasheet - Page 673

• Manufacturer Part Number: sc9s12hy64j0vllr
• Description: S12 Microcontrollers Mcu 16-bit Hcs12 Cisc 32kb Flash 5v Tray
• Manufacturer: Freescale Semiconductor, Inc

18.4
This section provides a complete functional description of the LCD40F4BV1 block, detailing the
operation of the design from the end user perspective in a number of subsections.
18.4.1
18.4.1.1
During a reset the following conditions exist:
18.4.1.2
The frequency of the source clock (IRCCLK) and divider determine the LCD clock frequency. The divider
is set by the LCD clock prescaler bits, LCLK[2:0], in the LCD control register 0 (LCDCR0).
shows the LCD clock and frame frequency for some multiplexed mode at IRCCLK = 16 MHz, 8 MHz, 4
MHz, 2 MHz, 1 MHz, and 0.5 MHz.
Freescale Semiconductor
Source clock
Frequency in
IRCCLK = 0.5
IRCCLK = 1.0
IRCCLK = 2.0
IRCCLK = 4.0
IRCCLK = 8.0
FP[39:0]
BP[3:0]
Field
•
•
39:0
3:0
MHz
The LCD40F4BV1 system is configured in the default mode, 1/4 duty and 1/3 bias, that means all
backplanes are used.
All frontplane enable bits, FP[39:0]EN are cleared and the ON/OFF control for the display, the
LCDEN bit is cleared, thereby forcing all frontplane and backplane driver outputs to the high
impedance state. The MCU pin state during reset is defined by the port integration module (PIM).
Functional Description
LCD Driver Description
LCD Segment ON — The FP[39:0]BP[3:0] bit displays (turns on) the LCD segment connected between FP[39:0]
and BP[3:0].
0 LCD segment OFF
1 LCD segment ON
Frontplane, Backplane, and LCD System During Reset
LCD Clock and Frame Frequency
LCLK2
LCD Clock Prescaler
0
0
0
0
0
0
0
1
1
1
LCLK1
0
0
0
1
1
1
1
0
0
0
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
Table 18-8. LCD Clock and Frame Frequency
Table 18-7. LCD RAM Field Descriptions
LCLK0
0
1
1
0
0
1
1
0
0
1
Divider
16384
16384
32768
1024
2048
2048
4096
4096
8192
8192
Frequency [Hz]
Description
LCD Clock
488
244
488
244
488
244
488
244
488
244
Liquid Crystal Display (LCD40F4BV1) Block Description
1/1 Duty
488
244
488
244
488
244
488
244
488
244
Frame Frequency [Hz]
1/2 Duty
244
122
244
122
244
122
244
122
244
122
1/3 Duty
163
163
163
163
163
81
81
81
81
81
Table 18-8
1/4 Duty
122
122
122
122
122
61
61
61
61
61
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