M16CSLASH29 datasheet(253/499 Pages) RENESAS

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15. A/D Converter

page 229

Figure 15.7 ADCON0 to ADCON2 Registers in One-Shot 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

TRG

ADST

A/D conversion start flag

0: A/D conversion disabled

1: A/D conversion started

Frequency select bit 0

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

Vref Connect Bit (2)

A/D Operation Mode

Select Bit 1

1 : Vref connected

0 0: One-shot mode or delayed trigger mode

0,1

b4 b3

Frequency Select Bit 1

CKS1

0 : Any mode other than repeat sweep

mode 1

See Table 15.2

Refer to Table 15.2

(b7-b6)

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

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 AN 0 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.

0: Software trigger

1: Hardware trigger (AD TRG trigger)

Invalid in one-shot mode

Nothing is assigned. If necessary, set to 0.

When read, the contents are 0

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.

NOTE:

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

A/D Control Register 2 (1)

Symbol

Address

After Reset

ADCON2

03D416

0016

b7 b6 b5 b4 b3 b2 b1 b0

A/D conversion method

select bit

Bit Symbol

Bit Name

Function

SMP

Reserved bit

Set to

A/D input group select

bit

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

b2 b1

Frequency select bit 2

CKS2

ADGSEL0

ADGSEL1

(b3)

Nothing is assigned. If necessary, set to 0.

When read, the content is 0

(b7-b6)

TRG1

Trigger select bit 1

0: Without sample and hold

1: With sample and hold

Set to 0 in one-shot mode

See Table 15.2

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