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A-D CONVERTER
The 4513/4514 Group has a built-in A-D conversion circuit that
performs conversion by 10-bit successive comparison method.
Table 14 shows the characteristics of this A-D converter. This A-
D converter can also be used as an 8-bit comparator to compare
analog voltages input from the analog input pin with preset val-
ues.
IAP4
(P4
P4
)
—
0
3
Q2
OP4A
(P4
P4
)
—
0
3
(Note 3)
A
/CMP0-
IN0
A
/CMP0+
IN1
A
/CMP1-
IN2
A
/CMP1+
IN3
P4
/A
0
IN4
P4
/A
1
IN5
P4
/A
2
IN6
P4
/A
3
IN7
Notes 1: This switch is turned ON only when A-D converter is operating and generates the comparison voltage.
2: Writing/reading data to the comparator register is possible only in the comparator mode (Q2
The value of the comparator register is retained even when the mode is switched to the A-D conversion
mode (Q2
=0) because it is separated from the successive comparison register (AD). Also, the resolution in
3
the comparator mode is 8 bits because the comparator register consists of 8 bits.
3: The 4513 Group does not have ports P4
Fig. 26 A-D conversion circuit structure
TAQ2
TAQ1
TQ1A
TQ2A
Q2
Q2
Q2
3
2
1
0
Q1
Q1
Q1
Q1
3
2
1
3
A-D control circuit
1
Comparator
0
Q2
3
DAC
operation
signal
(Note 1)
V
SS
Comparator register (8)
/A
0
4513/4514 Group User's Manual
FUNCTION BLOCK OPERATIONS
Table 14 A-D converter characteristics
Parameter
Conversion format
Resolution
Relative accuracy
Conversion speed
Analog input pin
Register B (4)
Register A (4)
0
Instruction clock
1/6
Q2
3
0
1
Successive comparison
register (AD) (10)
10
0
1
Q2
3
DA converter
(Note 2)
–P4
/A
and the IAP4 and OP4A instructions.
IN4
3
IN7
HARDWARE
Characteristics
Successive comparison method
10 bits
Linearity error: ±2LSB
Non-linearity error: ±0.9LSB
46.5 s (High-speed mode at 4.0 MHz
oscillation frequency)
4 for 4513 Group
8 for 4514 Group
4
4
4
4
2
8
8
TALA
TABAD
ADF
(1)
Q2
3
8
10
1
0
1
8
8
8
V
DD
=1).
3
TADAB
A-D interrupt
1-41
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