M16CSLASH62 datasheet(176/621 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

A-D Converter

161

Item

Specification

Function

All pins perform repeat sweep A-D conversion, with emphasis on the pin or

pins selected by the A-D sweep pin select bit

Example : AN0 selected

AN0

AN1

AN0

AN2

AN0

AN3, etc

Start 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

AN0 (1 pin), AN0 and AN1 (2 pins), AN0 to AN2 (3 pins), AN0 to AN3 (4 pins)

Reading of result of A-D converter

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

(5) Repeat sweep mode 1

In repeat sweep mode 1, all pins are used for A-D conversion with emphasis on the pin or pins selected

using the A-D sweep pin select bit. Table 1.20.6 shows the specifications of repeat sweep mode 1. Figure

1.20.8 shows the A-D control register in repeat sweep mode 1.

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 1 : Repeat sweep mode 1

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

1 : Repeat sweep mode 1

OPA1

A-D operation mode

select bit 1

1 : Vref connected

External op-amp

connection mode

bit (Note 2)

1 1

Invalid in repeat sweep mode 1

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 repeat sweep mode 1 is selected

0 0 : AN0 (1 pin)

0 1 : AN0, AN1 (2 pins)

1 0 : AN0 to AN2 (3 pins)

1 1 : AN0 to AN3 (4 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

Figure 1.20.8. A-D conversion register in repeat sweep mode 1

Table 1.20.6. Repeat sweep mode 1 specifications

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