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4556 Datasheet(PDF) 43 Page - Renesas Technology Corp

Part # 4556
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
PDF  145 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4556 Datasheet(HTML) 43 Page - Renesas Technology Corp

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Rev.3.02
Dec 22, 2006
page 43 of 142
REJ03B0025-0302
4556 Group
Fig. 33 LCD controller/driver
Common driver
Bias control
Multiplexer
Selector
RAM
Segment
driver
Selector
RAM
COM3
COM2
COM1
COM0
Decoder
SEG28
1/2,1/3,1/4 counter
LCD clock
(from timer block)
L10
L11
L12
L13
Register A
LCD ON/
OFF
control
Control
signal
SEG0/VLC3
SEG17
.........
...
...
Segment
driver
...
SEG1
/VLC2
SEG2/VLC1
SEG0 to SEG2
output
L20
L21
L22
L23
r
r
r
r
r
r
to
SEG10
SEG3
to
(3) LCD RAM
RAM contains areas corresponding to the liquid crystal display.
When “1” is written to this LCD RAM, the display pixel correspond-
ing to the bit is automatically displayed.
(4) LCD drive waveform
When “1” is written to a bit in the LCD RAM data, the voltage differ-
ence 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 dis-
play pixel turns off because every segment output pin and
common output pin becomes VLC3 level.
Fig. 34 LCD RAM map
Z
X
Y
Bits
8
9
10
11
12
13
14
15
COM
1
2
3
21
0
3
21
0
3
21
0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM3
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM2
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM0
SEG9
SEG10
COM3 COM2 COM1 COM0 COM3 COM2 COM1 COM0
SEG9
SEG10
SEG9
SEG10
SEG0
SEG0
SEG0 SEG0
SEG8
SEG17
SEG18
SEG19
SEG8 SEG8
SEG8
SEG9
SEG10
SEG17
SEG18
SEG19
SEG17
SEG18
SEG19
SEG17
SEG18
SEG19
0
1
Note: The area marked “
” is not the LCD display RAM.
SEG21
SEG22
SEG23
SEG20
3
3
21
0
COM3 COM2 COM1 COM0
SEG25
SEG26
SEG27
SEG24
SEG28
SEG21
SEG22
SEG23
SEG20
SEG21
SEG22
SEG23
SEG20
SEG21
SEG22
SEG23
SEG20
SEG25
SEG26
SEG27
SEG24
SEG28
SEG25
SEG26
SEG27
SEG24
SEG28
SEG25
SEG26
SEG27
SEG24
SEG28



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