M16CSLASH1N datasheet(139/238 Pages) RENESAS

139 / 238 page

Rev.1.00

Oct 20, 2004

page 127 of 222

M16C/1N Group

14. A/D Converter

REJ09B0007-0100Z

b5 b4

A/D control register 0 (Note 1)

CH0

CH1

CH2

Analog input pin select bit

ADGSEL0

A/D input group select bit

0 : Port P0 group is selected

1 : Port P1 group is selected

A/D operation mode

select bit 0

1 : Repeat mode (Note 2)

ADST

Reserved bit

Set to "0"

A/D conversion start flag

0 : A/D conversion disabled

1 : A/D conversion started

CKS0

Frequency select bit 0

0 : fAD/4 is selected

1 : fAD/2 is selected

Symbol

ADCON0

Address

00D616

When reset

00000XXX2

Function

Bit name

Bit symbol

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, AN8 are selected

1 0 1 : AN5, AN9 are selected

1 1 0 : AN6, AN10 are selected

1 1 1 : AN7, AN11 are selected (Note 2, 3)

b2 b1 b0

b5 b4

A/D control register 1 (Note 1)

Reserved bit

Set to "0"

VCUT

VREF connect bit

OPA0

External op-amp

connection mode bit

OPA1

CKS1

Frequency select bit 1

(Note 3)

0 : fAD/2 or fAD/4 is selected

1 : fAD is selected

1 : VREF connected

BITS

8/10-bit mode select bit

(Note 2)

0 : 8-bit mode

Symbol

ADCON1

Address

00D716

When reset

0016

Function

Bit name

Bit symbol

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.

Note 3: AN4 to AN7 and AN8 to AN11 are selected by the A/D input group select bit.

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

Note 2: In repeat mode, only 8-bit mode can be used.

Note 3: When f(XIN) is over 10 MHz, the ﬂAD frequency must be under 10 MHz by dividing.

Item

Specification

Function

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

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

One of AN0 to AN11, as selected (Note 1)

Reading of result of A/D converter

Read A/D register (at any time)

Note 1: AN4 to AN7 can be used in the same way as for AN8 to AN11.

Table 14.3 Repeat mode specifications

14.2 Repeat Mode

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

(See Table 14.3.) Figure 14.5 shows the A/D control register in repeat mode.

Figure 14.5 A/D conversion register in repeat mode

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