M30620FCAFP datasheet(438/615 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-121

Setting A-D conversion start flag

A-D control register 0 [Address 03D616]

ADCON0

A-D conversion start flag

1 : A-D conversion started

Reading conversion result

Eight low-order bits of A-D conversion result

(b15)

(b8)

A-D register 0

[Address 03C116, 03C016]

AD0

A-D register 1

[Address 03C316, 03C216]

AD1

During 10-bit mode

Two high-order bits of A-D conversion result

During 8-bit mode

When read, the content is indeterminate

Start A-D conversion

Stop A-D conversion

Setting A-D control register 0 and A-D control register 1

A-D control register 0 [Address 03D616]

ADCON0

Analog input pin select bit (Note)

0 0 0 : AN0 is selected(ANEX0)

0 0 1 : AN1 is selected(ANEX1)

b2 b1 b0

A-D control register 1 [Address 03D716]

ADCON1

A-D operation mode select bit 1 (Note)

0 (Must always be “0” in one-shot mode)

8/10-bit mode select bit

0 : 8-bit mode

1 : 10-bit mode

Frequency select bit 1

0 : fAD/2 or fAD/4 is selected

1 : fAD is selected

One-shot mode is selected (Note)

Trigger select bit

0 : Software trigger

A-D conversion start flag

0 : A-D conversion disabled

Frequency select bit 0

0 : fAD/4 is selected

1 : fAD/2 is selected

Invalid in one-shot mode

Vref connect bit

1 : Vref connected

External op-amp connection mode bit

0 1 : ANEX0 input is A-D converted

1 0 : ANEX1 input is A-D converted

b7 b6

Selecting sample and hold

A-D control register 2 [Address 03D416]

ADCON2

A-D conversion method select bit

1 : With sample and hold

Note: Rewrite to analog input pin select bit after changing A-D operation mode.

Figure 2.7.10. Set-up procedure of one-shot mode, with expanded analog input pin selected

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