M16CSLASH26 datasheet(161/239 Pages) RENESAS

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A-D Converter

155

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Figure 1.16.2. A-D converter control registers (1)

A-D control register 0 (Note 1)

Symbol

Address

When reset

ADCON0

03D616

00000XXX2

Analog input pin select bit

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)

CH0

Bit symbol

Bit name

Function

CH1

CH2

A-D operation mode

select bit 0

0 0 : One-shot mode

0 1 : Repeat mode

1 0 : Single sweep mode

1 1 : Repeat sweep mode 0

(Note 2)

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

Refer to table 1.16.2

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

Vref connect bit

A-D operation mode

select bit 1

0 : Any mode other than repeat sweep

mode 1

1 : Repeat sweep mode 1

0 : Vref not connected

1 : Vref connected

b2 b1 b0

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

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

CKS1

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

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

Refer to table 1.16.2

In an attempt to write to these bits, write 0. The value, if read, turns out to be 0.

Nothing is assigned.

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