
15-5
ML63326 User's Manual
Chapter 15 LCD Driver (LCD)
15
15.4 LCD Driver Operation
The display duty is selected from 1/1 to 1/16 using DSPCON. The frame frequency for each
duty ratio is indicated in Table 15-1. Depending on the duty selected, the common signal
(COM1 to COM16) is generated, and data written in synchronization with that common signal
to the display registers (DSPR0 to DSPR255) is output to the segment driver. The segment
driver uses bits 0, 1 (ALLON, LCDON) of the display control register 0 (DSPCON0) to control
all OFF or all ON mode.
When PDWN (bit 2 of DSPCON0) is set to "1", the LCD power down mode is enabled. In the
LCD power-down mode the bias generation circuit operation stops, and COM1–16 and
SEG0–63 pins are all output at the V
SS
level to reduce supply current.
BISEL (bit3 of DSPCON0) selects 1/4 or 1/5 bias.
DSPCNT controls the LCD contrast of 16 tones (V
DDH
= 2.4 V or more).
When the LCD driver is not used, select the power-down mode and set all the bits of the
display control register (DSPCNT) to "0" to save the supply current.
Table 15-1 Frame Frequency for Each Duty
DSPCON1
DT3 DT2 DT1 DT0
Duty
Frame
frequency
0
0
0
0
1/16
64 Hz
0
0
0
1
1/1
1024 Hz
0
0
1
0
1/2
512 Hz
0
0
1
1
1/3
approx. 341 Hz
0
1
0
0
1/4
256 Hz
0
1
0
1
1/5
approx. 205 Hz
0
1
1
0
1/6
approx. 171 Hz
0
1
1
1
1/7
approx. 146 Hz
1
0
0
0
1/8
128 Hz
1
0
0
1
1/9
approx. 114 Hz
1
0
1
0
1/10
approx. 102 Hz
1
0
1
1
1/11
approx. 93 Hz
1
1
0
0
1/12
approx. 85 Hz
1
1
0
1
1/13
approx. 79 Hz
1
1
1
0
1/14
approx. 73 Hz
1
1
1
1
1/15
approx. 68 Hz
DT3–0
0H
1H
2H
3H
4H
5H
6H
7H
8H
9H
0AH
0BH
0CH
0DH
0EH
0FH
Содержание ML63326
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Страница 14: ...Chapter 1 Overview 1 ...
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Страница 50: ...CPU Control Functions Chapter 3 3 ...
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Страница 57: ...3 6 ML63326 User s Manual Chapter 3 CPU Control Functions ...
Страница 58: ...Interrupt INT326 Chapter 4 4 ...
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Страница 71: ...4 12 ML63326 User s Manual Chapter 4 Interrupt INT326 ...
Страница 72: ...Clock Generator Circuit OSC Chapter 5 5 ...
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Страница 84: ...Time Base Counter TBC Chapter 6 6 ...
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Страница 90: ...Timers TIMER Chapter 7 7 ...
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Страница 115: ...7 24 ML63326 User s Manual Chapter 7 Timers TIMER ...
Страница 116: ...Chapter 8 8 100 Hz Timer Counter 100HzTC ...
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Страница 121: ...8 4 ML63326 User s Manual Chapter 8 100 Hz Timer Counter 100HzTC ...
Страница 122: ...Chapter 9 9 Watchdog Timer WDT ...
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Страница 128: ...Chapter 10 10 Ports INPUT OUTPUT I O PORT ...
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Страница 170: ...Chapter 11 11 External Memory Transfer Function EXTMEM ...
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Страница 179: ...11 8 ML63326 User s Manual Chapter 11 External Memory Transfer Function EXTMEM ...
Страница 180: ...Chapter 12 12 Melody Driver MELODY63K ...
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Страница 195: ...12 14 ML63326 User s Manual Chapter 12 Melody Driver MELODY63K ...
Страница 196: ...13 Chapter 13 Voice Synthesis ...
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Страница 228: ...14 Chapter 14 Shift Register SFT ...
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Страница 236: ...15 Chapter 15 LCD Driver LCD ...
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Страница 250: ...16 Chapter 16 Battery Low Detect Circuit BLD ...
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Страница 255: ...16 4 ML63326 User s Manual Chapter 16 Battery Low Detect Circuit BLD ...
Страница 256: ...Chapter 17 17 Power Supply Circuit POWER ...
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Страница 260: ...Appendixes ...
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Страница 321: ...Appendix 60 ML63326 User s Manual Appendix G ...