H8S2245 datasheet(561/818 Pages) RENESAS

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Section 14 A/D Converter

Rev.3.00 Mar. 26, 2007 Page 519 of 772

REJ09B0355-0300

14.5

Interrupts

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

request can be enabled or disabled by the ADIE bit in ADCSR.

The DTC can be activated by an ADI interrupt. Having the converted data read by the DTC 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 14.5.

Table 14.5

A/D Converter Interrupt Source

Interrupt Source

Description

DTC Activation

ADI

Interrupt due to end of conversion

Possible

14.6

Usage Notes

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

Module Stop Mode Setting

Operation of the A/D converter can be disabled or enabled using the module stop control register.

The initial setting is for operation of the A/D converter to be halted. Register access is enabled by

clearing module stop mode. For details, see section 18, Power-Down Modes.

Setting Range of Analog Power Supply and Other Pins

(1) Analog input voltage range

The voltage applied to analog input pins AN0 to AN3 during A/D conversion should be in the

range AV

SS ≤ ANn ≤ AVref.

(2) Relation between AV

CC, AVSS and VCC, VSS

As the relationship between AV

CC, AVSS and VCC, VSS, set AVSS = VSS. If the A/D converter is

not used, the AV

CC and AVSS pins must on no account be left open.

(3) V

ref input range

The analog reference voltage input at the V

ref pin set in the range Vref ≤ AVCC.

Note:

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

adversely affected.

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