lc75712e Sanyo Semiconductor Corporation, lc75712e Datasheet - Page 6

• Manufacturer Part Number: lc75712e
• Description: Dot Matrix Vfd Display Controller/driver
• Manufacturer: Sanyo Semiconductor Corporation

Block Functions
1. AC (address counter)
2. DCRAM (data control RAM)
3. ADRAM (additional data RAM)
AC is a counter that provides addresses for DCRAM and ADRAM.
The address is modified automatically by internal operations to maintain the VFD display state.
DCRAM is RAM that holds the display data, which is expressed as 8-bit character codes. (These character codes are
converted to 5 7 dot matrix patterns using the CGROM and CGRAM memories.) DCRAM has a capacity of 64 8
bits, and can hold the data for 64 characters. The relationship between the 6-bit DCRAM address in AC and the
display position on the VFD display is described below.
• When the DCRAM address in AC is 00
ADRAM is RAM used to store ADATA display data. ADRAM has a 16 8-bit capacity and the stored display data
is output directly without using CGROM and CGRAM. The relationship between the 4-bit ADRAM address in AC
and the display position on the VFD display is described below.
• When the ACRAM address in AC is 0
However, the DCRAM address moves as follows when a display shift is performed by specifying MDATA.
However, the ADRAM address moves as follows when a display shift is performed by specifying ADATA.
Note: The 6-bit DCRAM addresses are expressed in hexadecimal.
Note: DCRAM and ADRAM addresses are expressed in hexadecimal.
Example: When the DCRAM address is 3E
DCRAM address (hexadecimal)
DCRAM address (hexadecimal)
DCRAM address (hexadecimal)
ADRAM address (hexadecimal)
ADRAM address (hexadecimal)
ADRAM address (hexadecimal)
DA5
1
DA4
Display digit
Display digit
Display digit
Display digit
Display digit
Display digit
1
DCRAM address
ADRAM address
DA3
1
DA2
1
0E
DA1
16
0F
16
10
16
16
16
16
F
E
0
1
0E
0F
0D
H
15
15
15
15
15
15
E
D
F
.
MSB
MSB
DA0
Hexadecimal
DA5
RA3
0
LC75710NE, 75711NE, 75712E
0D
0E
0C
14
14
14
14
14
14
D
C
E
H
H
. (16 digits displayed)
. (16 digits displayed)
0C
0D
0B
13
13
13
13
13
13
C
D
B
Hexadecimal
DA4
RA2
0C
0A
12
0B
12
12
12
12
12
B
C
A
DA3
RA1
0A
0B
11
11
11
09
11
11
11
A
B
9
10
09
10
0A
10
08
10
10
10
A
9
8
Hexadecimal
DA2
RA0
LSB
08
09
07
9
9
9
9
8
9
9
9
7
DA1
07
08
06
8
8
8
8
7
8
8
8
6
06
07
05
7
7
7
7
6
7
7
7
5
DA0
LSB
05
06
04
6
6
6
6
5
6
6
6
4
04
05
03
5
5
5
5
4
5
5
5
3
03
04
02
4
4
4
4
3
4
4
4
2
02
03
01
3
3
3
3
2
3
3
3
1
01
02
00
2
2
2
2
2
2
2
0
1
3F
00
01
1
1
1
1
0
1
1
1
F
Right shift
Left shift
Right shift
Left shift
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