M16CSLASH26 datasheet(163/239 Pages) RENESAS

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A-D Converter

157

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 1.16.4. A-D conversion control registers in one-shot mode

(1) One-shot mode

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

conversion. Table 1.16.3 shows the specifications of one-shot mode. Figure 1.16.4 shows the settings of

the A-D control registers in one-shot mode.

Table 1.16.3. One-shot 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

• End of A-D conversion (A-D conversion start flag changes to "0" - except when

external trigger is selected

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

End of A-D conversion

Select one from AN0 to AN7

Read A-D register that corresponds to selected analog input pin

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

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

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

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 one-shot mode

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 0 : One-shot mode

(Note 2)

b4 b3

CH0

Frequency select bit1

Refer to table 1.16.2

CKS1

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.

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

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