TMP93CS32F datasheet(141/180 Pages) TOSHIBA

141 / 180 page

TMP93CS32

2004-02-10

93CS32-139

(4) AD conversion modes and completion interrupt

Follow the four AD conversion modes are supported.

•

Fixed channel single conversion mode

•

Channel scan single conversion mode

•

Fixed channel repeat conversion mode

•

Channel scan repeat conversion mode

AD conversion mode can selected by setting AD mode control register

ADMOD0<REPET, SCAN>.

When AD conversion ends, AD conversion completion interrupt INTAD request

occurs. And the ADMOD0<EOCF> flag is set to “1” to indicate that AD conversion has

completed.

1. Fixed channel single conversion mode

Fixed channel single conversion mode can be specified by setting

ADMOD0<REPET, SCAN> to “00”.

In this mode, conversion of the specified single channel is executed once only.

After conversion is completed, ADMOD0<EOCF> is set to “1”, ADMOD0<ADBF>

is cleared to “0” and occurs INTAD interrupt request.

2. Channel scan single conversion mode

Channel scan single conversion mode can be specified by setting

ADMOD0<REPET, SCAN> to “01”.

In this mode, conversion of the specified channel are executed once only. After

conversion is completed, ADMOD0<EOCF> is set to “1”, ADMOD0<ADBF> is

cleared to “0” and occurs INTAD interrupt request.

3. Fixed channel repeat conversion mode

Fixed channel repeat conversion mode can be specified by setting

ADMOD0<REPET, SCAN> to “10”.

In this mode, conversion of the specified single channel is executed repeatedly.

After conversion is completed, ADMOD0<EOCF> is set to “1”, ADMOD0<ADBF>

remains “1”, not changed to “0”. The timing of INTAD interrupt request can

selected by setting of ADMOD0<ITM0>.

When <ITM0> is set to “0”, interrupt request occurs after every conversion.

When <ITM0> is set to “1”, interrupt request occurs after every fourth

conversion.

4. Channel scan repeat conversion mode

Channel scan repeat conversion mode can be specified by setting

ADMOD0<REPET, SCAN> to “11”.

In this mode, specified channels are converted repeatedly. After every scan

convert completion, ADMOD0<EOCF> is set to “1” and INTAD interrupt request

occurs. ADMOD0<ADBF> remains “1”, not changed to “0”.

To stop the repeat conversion mode (3. and 4. modes), program “0” to

ADMOD0<REPET>. After the current conversion is completed repeat conversion

mode is terminated, and ADMOD0<ADBF> is cleared to “0” .

If the device enters the IDLE2, IDLE1 or STOP modes during AD conversion,

the conversion halts immediately. After the HALT mode is released, AD

conversion restarts from the beginning in repeat conversion mode (3. and 4.

modes), it does not restart in single conversion mode (1. and 2. modes).

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