HD6432351 datasheet(691/1025 Pages) RENESAS

691 / 1025 page

Section 15 A/D Converter

Rev. 3.00 Sep 15, 2006 page 657 of 988

REJ09B0330-0300

15.5

Interrupts

The A/D converter generates an A/D conversion end interrupt (ADI) at the end of A/D conversion.

ADI interrupt requests can be enabled or disabled by means of the ADIE bit in ADCSR.

The DTC or DMAC can be activated by an ADI interrupt. Having the converted data read by the

DTC or DMAC in response to an ADI interrupt enables continuous conversion to be achieved

without imposing a load on software.

The A/D converter interrupt source is shown in table 15.5.

Table 15.5 A/D Converter Interrupt Source

Interrupt Source

Description

DTC or DMAC Activation

ADI

Interrupt due to end of conversion

Possible

15.6

Usage Notes

The following points should be noted when using the A/D converter.

Setting Range of Analog Power Supply and Other Pins

(1) Analog input voltage range

The voltage applied to analog input pins AN0 to AN7 during A/D conversion should be in the

range AVSS ≤ ANn ≤ Vref.

(2) Relation between AVCC, AVSS and VCC, VSS

As the relationship between AVCC, AVSS and VCC, VSS, set AVSS = VSS. If the A/D converter is

not used, the AVCC and AVSS pins must on no account be left open.

(3) Vref input range

The analog reference voltage input at the Vref pin set in the range Vref ≤ AVCC.

If conditions (1), (2), and (3) above are not met, the reliability of the device may be adversely

affected.

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