
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
Summary of Contents for ML63326
Page 3: ......
Page 13: ......
Page 14: ...Chapter 1 Overview 1 ...
Page 15: ......
Page 37: ...1 22 ML63326 User s Manual Chapter 1 Overview ...
Page 38: ...Chapter 2 CPU and Memory Spaces 2 ...
Page 39: ......
Page 50: ...CPU Control Functions Chapter 3 3 ...
Page 51: ......
Page 57: ...3 6 ML63326 User s Manual Chapter 3 CPU Control Functions ...
Page 58: ...Interrupt INT326 Chapter 4 4 ...
Page 59: ......
Page 71: ...4 12 ML63326 User s Manual Chapter 4 Interrupt INT326 ...
Page 72: ...Clock Generator Circuit OSC Chapter 5 5 ...
Page 73: ......
Page 83: ...5 10 ML63326 User s Manual Chapter 5 Clock Generator Circuit OSC ...
Page 84: ...Time Base Counter TBC Chapter 6 6 ...
Page 85: ......
Page 90: ...Timers TIMER Chapter 7 7 ...
Page 91: ......
Page 115: ...7 24 ML63326 User s Manual Chapter 7 Timers TIMER ...
Page 116: ...Chapter 8 8 100 Hz Timer Counter 100HzTC ...
Page 117: ......
Page 121: ...8 4 ML63326 User s Manual Chapter 8 100 Hz Timer Counter 100HzTC ...
Page 122: ...Chapter 9 9 Watchdog Timer WDT ...
Page 123: ......
Page 128: ...Chapter 10 10 Ports INPUT OUTPUT I O PORT ...
Page 129: ......
Page 170: ...Chapter 11 11 External Memory Transfer Function EXTMEM ...
Page 171: ......
Page 179: ...11 8 ML63326 User s Manual Chapter 11 External Memory Transfer Function EXTMEM ...
Page 180: ...Chapter 12 12 Melody Driver MELODY63K ...
Page 181: ......
Page 195: ...12 14 ML63326 User s Manual Chapter 12 Melody Driver MELODY63K ...
Page 196: ...13 Chapter 13 Voice Synthesis ...
Page 197: ......
Page 228: ...14 Chapter 14 Shift Register SFT ...
Page 229: ......
Page 236: ...15 Chapter 15 LCD Driver LCD ...
Page 237: ......
Page 250: ...16 Chapter 16 Battery Low Detect Circuit BLD ...
Page 251: ......
Page 255: ...16 4 ML63326 User s Manual Chapter 16 Battery Low Detect Circuit BLD ...
Page 256: ...Chapter 17 17 Power Supply Circuit POWER ...
Page 257: ......
Page 260: ...Appendixes ...
Page 261: ......
Page 321: ...Appendix 60 ML63326 User s Manual Appendix G ...