M16CSLASH26 datasheet(164/239 Pages) RENESAS

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Renesas Technology Corp.

A-D Converter

158

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 1.16.5. A-D conversion control registers in repeat mode

(2) Repeat mode

In repeat mode, the pin selected using the analog input pin select bits , is used for one-shot A-D conver-

sion. Table 1.16.4 shows the specifications of repeat mode. Figure 1.16.5 shows the settings of the A-D

control registers in repeat-shot mode.

Table 1.16.4. Repeat mode specifications

Item

Function

Start condition

Stop condition

Interrupt request

generation timing

Input pin

Reading of A-D result

The pin selected by the analog input pin select bits is used for one A-D conversion

Specification

Writing "1" to the A-D conversion start flag

Writing "0" to the A-D conversion start flag

None generated

Select one from AN0 to AN7

Read A-D register that corresponds to selected analog input pin (at any time)

Note 2: If the VCUT bit is reset from "0" (Vref unconnected) to "1" (Vref connected), wait for 1 µs or more before starting

A-D conversion.

A-D control register 0 (Note 1)

Symbol

Address

When reset

ADCON0

03D616

00000XXX2

A-D control register 1 (Note 1)

Symbol

Address

When reset

ADCON1

03D716

0016

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 pins again.

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

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

Nothing is assigned.

Vref connect bit (Note 2)

A-D operation mode

select bit 1

Set to 0 when this mode is selected

1 : Vref connected

Invalid in repeat mode

Frequency select bit1

Refer to table 1.16.2

CKS1

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

Analog input pin select

bit

Bit symbol

Bit name

Function

CH1

CH2

A-D operation mode

select bit 0

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

Refer to table 1.16.2

CKS0

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)

b2 b1 b0

0 1 : Repeat mode

(Note 2)

b4 b3

CH0

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