H8SXSLASH1663 datasheet(913/1158 Pages) RENESAS

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Section 18 A/D Converter

Rev.1.00 Jun. 07, 2006 Page 861 of 1102

REJ09B0294-0100

18.5

Interrupt Source

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

Setting the ADIE bit to 1 when the ADF bit in ADCSR is set to 1 after A/D conversion is

completed enables ADI interrupt requests. The data transfer controller (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.

Table 18.5

A/D Converter Interrupt Source

Name

Interrupt Source

Interrupt Flag

DTC Activation

DMAC Activation

ADI0

A/D conversion end

ADF

Possible

18.6

A/D Conversion Accuracy Definitions

This LSI's A/D conversion accuracy definitions are given below.

• Resolution

The number of A/D converter digital output codes.

• Quantization error

The deviation inherent in the A/D converter, given by 1/2 LSB (see figure 18.6).

• Offset error

The deviation of the analog input voltage value from the ideal A/D conversion characteristic

when the digital output changes from the minimum voltage value B'0000000000 (H'000) to

B'0000000001 (H'001) (see figure 18.7).

• Full-scale error

The deviation of the analog input voltage value from the ideal A/D conversion characteristic

when the digital output changes from B'1111111110 (H'3FE) to B'1111111111 (H'3FF) (see

figure 18.7).

• Nonlinearity error

The error with respect to the ideal A/D conversion characteristic between the zero voltage and

the full-scale voltage. Does not include the offset error, full-scale error, or quantization error

(see figure 18.7).

• Absolute accuracy

The deviation between the digital value and the analog input value. Includes the offset error,

full-scale error, quantization error, and nonlinearity error.

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