4583 Datasheet, PDF (45/153 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4583 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
A/D CONVERTER (Comparator)
The 4583 Group has a built-in A/D conversion circuit that performs
conversion by 10-bit successive comparison method. Table 11
shows the characteristics of this A/D converter. This A/D converter
can also be used as an 8-bit comparator to compare analog volt-
ages input from the analog input pin with preset values.
Table 11 A/D converter characteristics
Parameter
Characteristics
Conversion format Successive comparison method
Resolution
10 bits
Relative accuracy Linearity error: ±2LSB (2.7 V ≤ VDD ≤ 5.5V)
Differential non-linearity error:
±0.9LSB (2.2 V ≤ VDD ≤ 5.5V)
Conversion speed 31 µs (f(XIN) = 6 MHz, STCK = f(XIN) (XIN
through-mode), ADCK = INSTCK/6)
Analog input pin 2
Register B (4)
IAP6
(P60–P63)
OP6A
(P60–P63)
P60/AIN0
P61/AIN1
Register A (4)
4 ^TAQ1
TQ1A
4 ^TAQ2
TQ2A
4 ^TAQ3
TQ3A
Q13 Q12 Q11 Q10 ^Q23 Q22 Q21 Q20 ^{Q33 Q32 Q31 Q30}
2
Q32
Instruction clock ⁰
3 _{On-chip oscillator 1}
clock
Division circuit _{Q31, Q30}
TALA
Divided by 48
11
Divided by 24 ₁₀
A/D conversion clock
Divided by 12 ₀₁
(ADCK)
Divided by 6 ₀₀
Q13
0
A/D control circuit
1
ADF
(1)
44
44
8
TABAD
8
TADAB
A/D
interrupt
1
Comparator
Successive comparison
0
register (AD) (10)
Q13
10
10
DAC
operation
signal
0
1
Q13
Q13
8
01
1
8
DA converter
(Note 1)
VDD
VSS
Comparator register (8)
(Note 2)
88
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 (Q13=1).
The value of the comparator register is retained even when the mode is switched to the A/D conversion
mode (Q13=0) because it is separated from the successive comparison register (AD). Also, the resolution
in the comparator mode is 8 bits because the comparator register consists of 8 bits.
Fig. 35 A/D conversion circuit structure
Rev.3.00 Aug 06, 2004 page 45 of 151
REJ03B0009-0300Z