Interrupt Source; A/D Conversion Accuracy Definitions; Table 19.4 A/D Converter Interrupt Source - Renesas H8S Series Hardware Manual

19.5

Interrupt Source

The A/D converter generates an A/D conversion end interrupt (ADI) at the end of A/D
conversion. If the ADF bit in ADCSR has been set to 1 after A/D conversion ends and the ADIE
bit is set to 1, an ADI interrupt request is enabled.
The ADI interrupt can be used to activate the on-chip DTC.

Table 19.4 A/D Converter Interrupt Source

Name Interrupt Source
ADI A/D conversion end
19.6

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 19.4).
•
Offset error
The deviation of the analog input voltage value from the ideal A/D conversion characteristics
when the digital output changes from the minimum voltage value B'00 0000 0000 (H'000) to
B'00 0000 0001 (H'001) (see figure 19.5).
•
Full-scale error
The deviation of the analog input voltage value from the ideal A/D conversion characteristics
when the digital output changes from B'11 1111 1110 (H'3FE) to B'11 1111 1111 (H'3FF) (see
figure 19.5).
•
Nonlinearity error
The error with respect to the ideal A/D conversion characteristics between the zero voltage
and the full-scale voltage. Does not include the offset error, full-scale error, or quantization
error (see figure 19.5).
•
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.
Interrupt Flag
ADF
Rev. 3.00 Jul. 14, 2005 Page 727 of 986
Section 19 A/D Converter
DTC Activation
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REJ09B0098-0300