M16CSLASH26 datasheet(165/239 Pages) RENESAS

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A-D Converter

159

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 1.16.6. A-D conversion control registers in single sweep mode

(3) Single sweep mode

In single sweep mode, the pins selected using the A-D sweep pin select bits, are used for one-by-one A-

D conversion. Table 1.16.5 shows the specifications of single sweep mode. Figure 1.16.6 shows the

settings of the A-D control registers in single sweep mode.

Table 1.16.5. Single sweep 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

AN0 - AN1 (2 pins), AN0 - AN3 (4 pins), AN0 - AN5 (6 pins), or AN0 - AN7 (8 pins)

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.

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

A-D control register 0 (Note)

Symbol

Address

When reset

ADCON0

03D616

00000XXX2

A-D control register 1 (Note 1)

Symbol

Address

When reset

ADCON1

03D716

0016

1 0

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

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

1 0 : Single sweep mode

b4 b3

CH0

Invalid in single sweep mode

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

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.

When single sweep mode is 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

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