M16CSLASH29 datasheet(255/499 Pages) RENESAS

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15. A/D Converter

page 231

Figure 15.9 ADCON0 to ADCON2 Registers in Repeat Mode

A/D Control Register 0 (1)

Symbol

Address

After Reset

ADCON0

03D616

00000XXX2

b7 b6 b5 b4 b3 b2 b1 b0

Analog input pin select

bit(2, 3)

CH0

Bit Symbol

Bit Name

Function

CH1

CH2

A/D operation mode

select bit 0 (3)

MD0

MD1

Trigger select bit

0: Software trigger

1: Hardware trigger (ADTRG trigger)

TRG

ADST

A/D conversion start flag

0: A/D conversion disabled

1: A/D conversion started

Frequency select bit 0

See Table 15.2

CKS0

A/D Control Register 1 (1)

Symbol

Address

After Reset

ADCON1

03D716

0016

Bit Name

Function

Bit Symbol

b7 b6 b5 b4 b3 b2 b1 b0

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

A/D operation mode

select bit 1

0: Other than repeat sweep mode 1

1: Vref connected

Frequency select bit 1

CKS1

Invalid in repeat mode

See Table 15.2

Nothing is assigned. If necessary, set to 0.

When read, the content is 0

(b7-b6)

NOTES:

1. If the ADCON1 register is rewritten during A/D conversion, the conversion result will be undefined.

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.

Vref connect bit (2)

A/D Control Register 2(1)

Symbol

Address

After Reset

ADCON2

03D416

0016

Bit Name

Function

Bit Symbol

b7 b6 b5 b4 b3 b2 b1 b0

A/D conversion method

select bit

SMP

Reserved bit

Set to 0

TRG1

A/D input group select bit

b2 b1

0 0: Select port P10 group

0 1: Select port P9 group

1 0: Select port P0 group

1 1: Select port P1/P9 group

Set to 0 in one-shot mode

Frequency select bit 2

CKS2

0: Without sample and hold

1: With sample and hold

See Table 15.2

Nothing is assigned. If necessary, set to 0.

When read, the content is 0

(b7-b6)

NOTE:

1. If the ADCON2 register is rewritten during A/D conversion, the conversion result will be undefined.

Trigger select bit

ADGSEL0

ADGSEL1

(b3)

b2 b1 b0

0 0 0: Select AN0

0 0 1: Select AN1

0 1 0: Select AN2

0 1 1: Select AN3

1 0 0: Select AN4

1 0 1: Select AN5

1 1 0: Select AN6

1 1 1: Select AN7

b4 b3

0 1: Repeat mode

NOTES:

1. If the ADCON0 register is rewritten during A/D conversion, the conversion result will be undefined.

2. AN00 to AN07, AN20 to AN27, and AN30 to AN32 can be used in the same way as AN0 to AN7. Use bits ADGSEL1

and ADGSEL 0 in the ADCON2 register to select the desired pin.

3. After rewriting bits MD1 and MD0, set bits CH2 to CH0 over again using an another instruction.

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