M30620FCAFP datasheet(174/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

A-D Converter

1-155

(3) Single sweep mode

In single sweep mode, the pins selected using the A-D sweep pin select bit are used for one-by-one A-D

conversion. Table 1.17.4 shows the specifications of single sweep mode. Figure 1.17.6 shows the A-D

control register in single sweep mode.

Table 1.17.4. Single sweep mode specifications

Figure 1.17.6. A-D conversion register in single sweep mode

A-D control register 0 (Note)

Symbol

Address

When reset

ADCON0

03D616

00000XXX2

Analog input pin

select bit

CH0

Bit symbol

Bit name

Function

CH1

CH2

A-D operation mode

select bit 0

1 0 : Single sweep mode

MD0

MD1

Trigger select bit

0 : Software trigger

1 : ADTRG trigger

TRG

ADST

A-D conversion start flag

0 : A-D conversion disabled

1 : A-D conversion started

Frequency select bit 0

0 : fAD/4 is selected

1 : fAD/2 is selected

CKS0

A-D control register 1 (Note 1)

Symbol

Address

When reset

ADCON1

03D716

0016

Bit name

Function

Bit symbol

A-D sweep pin select bit

SCAN0

SCAN1

MD2

BITS

8/10-bit mode select bit

0 : 8-bit mode

1 : 10-bit mode

VCUT

OPA0

Vref connect bit

OPA1

A-D operation mode

select bit 1

1 : Vref connected

External op-amp

connection mode

bit (Note 2)

1 0

Invalid in single sweep mode

Note 1: If the A-D control register is rewritten during A-D conversion, the conversion result

is indeterminate.

Note 2: Neither ‘01’ nor ‘10’ can be selected with the external op-amp connection mode bit.

b4 b3

When single sweep and repeat sweep mode 0

are selected

0 0 : AN0, AN1 (2 pins)

0 1 : AN0 to AN3 (4 pins)

1 0 : AN0 to AN5 (6 pins)

1 1 : AN0 to AN7 (8 pins)

b1 b0

0 0 : ANEX0 and ANEX1 are not used

0 1 : ANEX0 input is A-D converted

1 0 : ANEX1 input is A-D converted

1 1 : External op-amp connection mode

b7 b6

Note: If the A-D control register is rewritten during A-D conversion, the conversion result

is indeterminate.

Frequency select bit 1

0 : fAD/2 or fAD/4 is selected

1 : fAD is selected

CKS1

Set to “0” when this mode is selected

Item

Specification

Function

The pins selected by the A-D sweep pin select bit are used for one-by-one A-D conversion

Start condition

Writing “1” to A-D converter start flag

Stop condition

• End of A-D conversion (A-D conversion start flag changes to “0”, except

when external trigger is selected)

• Writing “0” to A-D conversion start flag

Interrupt request generation timing

End of A-D conversion

Input pin

AN0 and AN1 (2 pins), AN0 to AN3 (4 pins), AN0 to AN5 (6 pins), or AN0 to AN7 (8 pins)

Reading of result of A-D converter

Read A-D register corresponding to selected pin

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