TMP86FS23UG datasheet(165/252 Pages) TOSHIBA

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Page 153

TMP86FS23UG

13.3 Function

13.3.1 Software Start Mode

After setting ADCCR1<AMD> to “01” (software start mode), set ADCCR1<ADRS> to “1”. AD conver-

sion of the voltage at the analog input pin specified by ADCCR1<SAIN> is thereby started.

After completion of the AD conversion, the conversion result is stored in AD converted value registers

(ADCDR1, ADCDR2) and at the same time ADCDR2<EOCF> is set to 1, the AD conversion finished inter-

rupt (INTADC) is generated.

ADRS is automatically cleared after AD conversion has started. Do not set ADCCR1<ADRS> newly again

(Restart) during AD conversion. Before setting ADRS newly again, check ADCDR2<EOCF> to see that the

conversion is completed or wait until the interrupt signal (INTADC) is generated (e.g., interrupt handling rou-

tine).

Figure 13-2 Software Start Mode

13.3.2 Repeat Mode

AD conversion of the voltage at the analog input pin specified by ADCCR1<SAIN> is performed repeatedly.

In this mode, AD conversion is started by setting ADCCR1<ADRS> to “1” after setting ADCCR1<AMD> to

“11” (Repeat mode).

After completion of the AD conversion, the conversion result is stored in AD converted value registers

(ADCDR1, ADCDR2) and at the same time ADCDR2<EOCF> is set to 1, the AD conversion finished inter-

rupt (INTADC) is generated.

In repeat mode, each time one AD conversion is completed, the next AD conversion is started. To stop AD

conversion, set ADCCR1<AMD> to “00” (Disable mode) by writing 0s. The AD convert operation is stopped

immediately. The converted value at this time is not stored in the AD converted value register.

ADCDR1 status

EOCF cleared by reading

conversion result

Conversion result

read

ADCDR2<EOCF>

INTADC interrupt request

ADCDR2<ADBF>

ADCCR1<ADRS>

1st conversion result

2nd conversion result

Indeterminate

AD conversion start

ADCDR1

ADCDR2

Conversion result

read

Conversion result

read

Conversion result

read

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