M30622ECTFP datasheet(154/184 Pages) MITSUBISHI

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154

Tentative Specifications REV.A

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Specifications in this manual are tentative and subject to change.

Under

development

A-D Converter

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) (Note1 )

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 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

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 4)

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: Divide the frequency if f(XIN) exceeds 10MHz, and make

φAD frequency equal to

10MHz.

Note 3: AN00 to AN07, and AN20 to AN27 can be used the same as AN0 to AN7.

Note 4: 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 1: 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

(Note 2)

(Note 3)

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

Table 1.20.6. Repeat sweep mode 1 specifications

Note 1: AN00 to AN07, and AN20 to AN27 can be used the same as AN0 to AN7.

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