M30620FCAFP datasheet(173/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

A-D Converter

1-154

(2) Repeat mode

In repeat mode, the pin selected using the analog input pin select bit is used for repeated A-D conversion.

Table 1.17.3 shows the specifications of repeat mode. Figure 1.17.5 shows the A-D control register in

repeat mode.

A-D control register 0 (Note 1)

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

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)

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

Invalid in repeat mode

0 0 0 : AN0 is selected

0 0 1 : AN1 is selected

0 1 0 : AN2 is selected

0 1 1 : AN3 is selected

1 0 0 : AN4 is selected

1 0 1 : AN5 is selected

1 1 0 : AN6 is selected

1 1 1 : AN7 is selected

(Note 2)

b2 b1 b0

0 1 : Repeat mode

(Note 2)

b4 b3

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

result is indeterminate.

Note 2: When changing A-D operation mode, set analog input pin again.

Frequency select bit 1

0 : fAD/2 or fAD/4 is selected

1 : fAD is selected

CKS1

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

result is indeterminate.

Set to “0” when this mode is selected

Figure 1.17.5. A-D conversion register in repeat mode

Item

Specification

Function

The pin selected by the analog input pin select bit is used for repeated A-D conversion

Star condition

Writing “1” to A-D conversion start flag

Stop condition

Writing “0” to A-D conversion start flag

Interrupt request generation timing

None generated

Input pin

One of AN0 to AN7, as selected

Reading of result of A-D converter

Read A-D register corresponding to selected pin (at any time)

Table 1.17.3. Repeat mode specifications

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