M16CSLASH26 datasheet(167/239 Pages) RENESAS

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A-D Converter

161

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.

(5) Repeat sweep mode 1

In repeat sweep mode 1, all pins are used for A-D conversion with emphasis on the pin or pins selected

using the A-D sweep pin select bits. Table 1.16.7 shows the specifications of repeat sweep mode 1.

Figure 1.16.8 shows the settings of the A-D control registers in repeat sweep mode 1.

Figure 1.16.8. A-D conversion control registers in repeat sweep mode 1

Table 1.16.7. Repeat sweep mode 1 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

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

With emphasis on these pins:

AN0, AN0 - AN1 (2 pins), AN0 - AN2 (3 pins), AN0 - AN3 (4 pins)

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.

1 1 : AN0 to AN3 (4 pins)

1 0 : AN0 to AN2 (3 pins)

0 1 : AN0, AN1 (2 pins)

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 1

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 1 : Repeat sweep mode 1

b4 b3

CH0

Invalid in repeat sweep mode 1

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 1 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 repeat sweep mode 1 is selected

0 0 : AN0 (1 pin)

b1 b0

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