M34551E8 View Datasheet(PDF) - MITSUBISHI ELECTRIC
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M34551E8
MITSUBISHI ELECTRIC
M34551E8 Datasheet PDF : 68 Pages
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MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
(3) LCD RAM
RAM contains areas corresponding to the liquid crystal display.
When “1” is written to this LCD RAM, the display pixel
corresponding to the bit is automatically displayed.
(4) LCD drive waveform
When “1” is written to a bit in the LCD RAM data, the voltage
difference between common pin and segment pin which
correspond to the bit automatically becomes lVLC3l and the
display pixel at the cross section turns on.
When returning from reset, and in the RAM back-up mode, a
display pixel turns off because every segment output pin and
common output pin becomes VLC3 level (=VDD).
Z
1
X
0
1
2
Y
Bit 3
2
1
0
3
2
1
0
3
2
1
0
8
SEG0 SEG0 SEG0 SEG0 SEG8 SEG8 SEG8 SEG8 SEG16 SEG16 SEG16 SEG16
9
SEG1 SEG1 SEG1 SEG1 SEG9 SEG9 SEG9 SEG9 SEG17 SEG17 SEG17 SEG17
10
SEG2 SEG2 SEG2 SEG2 SEG10 SEG10 SEG10 SEG10 SEG18 SEG18 SEG18 SEG18
11
SEG3 SEG3 SEG3 SEG3 SEG11 SEG11 SEG11 SEG11 SEG19 SEG19 SEG19 SEG19
12
SEG4 SEG4 SEG4 SEG4 SEG12 SEG12 SEG12 SEG12
13
SEG5 SEG5 SEG5 SEG5 SEG13 SEG13 SEG13 SEG13
14
SEG6 SEG6 SEG6 SEG6 SEG14 SEG14 SEG14 SEG14
15
SEG7 SEG7 SEG7 SEG7 SEG15 SEG15 SEG15 SEG15
COM COM3 COM2 COM1 COM0 COM3 COM2 COM1 COM0 COM3 COM2 COM1 COM0
Note: The area marked “ ” is not the LCD display RAM.
Fig. 26 LCD RAM map
Table 13 LCD control registers
LCD control register L1
L13 Not used
L12 LCD on/off bit
L11
LCD duty and bias selection bits
L10
at reset : 00002
at power down : state retained
0
1 This bit has no function, but read/write is enabled
0 Off
1 On
L11 L10
Duty
Bias
00
01
Not available
1/2
1/2
10
1/3
1/3
11
1/4
1/3
R/W
LCD control register L2
at reset : 11112
L23 P23/SEG19 pin function switch bit
0 SEG19
1 P23
L22 P22/SEG18 pin function switch bit
0 SEG18
1 P22
L21 P21/SEG17 pin function switch bit
0 SEG17
1 P21
L20 P20/SEG16 pin function switch bit
0 SEG16
1 P20
Note: “R” represents read enabled, and “W” represents write enabled.
at power down : state retained
W
28
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