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参数资料
型号： M38254M6-XXXFP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP100
封装： 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件页数： 37/73页
文件大小： 1323K
代理商： M38254M6-XXXFP
Rev.2.02
Jun 19, 2007
page 40 of 73
REJ03B0146-0202
3823 Group
LCD DRIVE CONTROL CIRCUIT
The 3823 group has the built-in Liquid Crystal Display (LCD) drive
control circuit consisting of the following.
●LCD display RAM
●Segment output enable register
●LCD mode register
●Selector
●Timing controller
●Common driver
●Segment driver
●Bias control circuit
A maximum of 32 segment output pins and 4 common output pins
can be used.
Up to 128 pixels can be controlled for LCD display. When the LCD
Fig. 36 Structure of segment output enable register and LCD mode register
enable bit is set to “1” after data is set in the LCD mode register,
the segment output enable register and the LCD display RAM, the
LCD drive control circuit starts reading the display data automati-
cally, performs the bias control and the duty ratio control, and
displays the data on the LCD panel.
Table 10 Maximum number of display pixels at each duty ratio
Duty ratio
Maximum number of display pixel
64 dots
or 8 segment LCD 8 digits
96 dots
or 8 segment LCD 12 digits
128 dots
or 8 segment LCD 16 digits
2
3
4
LCD mode register
(LM : address 003916)
Segment output enable register
(SEG : address 003816)
Duty ratio selection bits
0 0 : Not used
0 1 : 2 (use COM0, COM1)
1 0 : 3 (use COM0–COM2)
1 1 : 4 (use COM0–COM3)
Bias control bit
0 : 1/3 bias
1 : 1/2 bias
LCD enable bit
0 : LCD OFF
1 : LCD ON
Not used (returns “0” when read)
(Do not write “1” to this bit)
LCD circuit divider division ratio selection bits
0 0 : Clock input
0 1 : 2 division of clock input
1 0 : 4 division of clock input
1 1 : 8 division of clock input
LCDCK count source selection bit (Note)
0 : f(SUB)/32
1 : f(XIN)/8192 (or f(SUB)/8192 in low-speed
mode)
Note: LCDCK is a clock for a LCD timing controller.
f(SUB) is the source oscillation frequency in low-speed mode. f(SUB) shows the oscillation
frequency of XCIN or the on-chip oscillator.
Internal clock φ is f(SUB)/2 in the low-speed mode.
Segment output enable bit 0
0 : Input port P34–P37
1 : Segment output SEG12–SEG15
Segment output enable bit 1
0 : I/O port P00,P01
1 : Segment output SEG16, SEG17
Segment output enable bit 2
0 : I/O port P02–P07
1 : Segment output SEG18–SEG23
Segment output enable bit 3
0 : I/O port P10,P11
1 : Segment output SEG24, SEG25
Segment output enable bit 4
0 : I/O port P12
1 : Segment output SEG26
Segment output enable bit 5
0 : I/O port P13–P17
1 : Segment output SEG27–SEG31
Not used (returns “0” when read)
(Do not write
“1” to this bit.)
b7b0
b7
b0
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