TMP86CS44UG datasheet(150/172 Pages) TOSHIBA

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Page 140

13. 10-bit AD Converter (ADC)

13.3 Function

TMP86CS44UG

Figure 13-3 Repeat Mode

13.3.3 Register Setting

1. Set up the AD converter control register 1 (ADCCR1) as follows:

• Choose the channel to AD convert using AD input channel select (SAIN).

• Specify analog input enable for analog input control (AINDS).

• Specify AMD for the AD converter control operation mode (software or repeat mode).

2. Set up the AD converter control register 2 (ADCCR2) as follows:

• Set the AD conversion time using AD conversion time (ACK). For details on how to set the con-

version time, refer to Figure 13-1 and AD converter control register 2.

• Choose IREFON for DA converter control.

3. After setting up (1) and (2) above, set AD conversion start (ADRS) of AD converter control register 1

(ADCCR1) to “1”. If software start mode has been selected, AD conversion starts immediately.

4. After an elapse of the specified AD conversion time, the AD converted value is stored in AD con-

verted value register 1 (ADCDR1) and the AD conversion finished flag (EOCF) of AD converted

value register 2 (ADCDR2) is set to “1”, upon which time AD conversion interrupt INTADC is gener-

ated.

5. EOCF is cleared to “0” by a read of the conversion result. However, if reconverted before a register

read, although EOCF is cleared the previous conversion result is retained until the next conversion is

completed.

ADCDR1,ADCDR2

EOCF cleared by reading

conversion result

Conversion

result read

ADCDR2<EOCF>

INTADC interrupt request

Conversion operation

ADCCR1<ADRS>

Indeterminate

AD conversion start

ADCCR1<AMD>

“11”

“00”

1st conversion

result

AD convert operation suspended.

Conversion result is not stored.

2nd conversion result

3rd conversion result

ADCDR1

ADCDR2

2nd conversion result

3rd conversion result

1st conversion result

Conversion

result read

Conversion

result read

Conversion

result read

Conversion

result read

Conversion

result read

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