4513 datasheet(40/97 Pages) RENESAS

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4513/4514 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

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.

Table 14 A-D converter characteristics

Characteristics

Successive comparison method

10 bits

Linearity error: ±2LSB

Non-linearity error: ±0.9LSB

46.5

µs (High-speed mode at 4.0 MHz

oscillation frequency)

4 for 4513 Group

8 for 4514 Group

Parameter

Conversion format

Resolution

Relative accuracy

Conversion speed

Analog input pin

Fig. 26 A-D conversion circuit structure

VSS

VDD

IAP4

(P40—P43)

TABAD

1/6

Q23

Q11 Q10

Q12

TADAB

Q22 Q21 Q20

Q23

DAC

operation

signal

Q23

TALA

Q23

Q13

TAQ1

TQ1A

TAQ2

TQ2A

ADF

(1)

AIN0/CMP0-

AIN1/CMP0+

AIN2/CMP1-

AIN3/CMP1+

P40/AIN4

P41/AIN5

P42/AIN6

P43/AIN7

Comparator

Instruction clock

A-D control circuit

Successive comparison

A-D interrupt

DA converter

(Note 1)

Comparator register (8)

(Note 2)

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 (Q23=1).

The value of the comparator register is retained even when the mode is switched to the A-D conversion

mode (Q23=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.

3: The 4513 Group does not have ports P40/AIN4–P43/AIN7 and the IAP4 and OP4A instructions.

(Note 3)

OP4A

(P40—P43)

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