Interrupt Source; A/D Conversion Accuracy Definitions - Renesas H8S/2100 Series Hardware Manual

22.5

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.
Table 22.6 A/D Converter Interrupt Source
Name
ADI
22.6

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 22.3).
•
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 22.4).
•
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 22.4).
•
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 22.4).
•
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 Source
A/D conversion end
Section 22 A/D Converter
Interrupt Flag
ADF
Rev. 1.00 Apr. 28, 2008 Page 739 of 994
REJ09B0452-0100