SH7101 Datasheet, PDF (372/486 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

11. A/D Converter
11.5 Interrupt Sources
The A/D converter generates an A/D conversion end interrupt (ADI) upon the completion of A/D
conversion. ADI interrupt requests are enabled when the ADIE bit is set to 1 while the ADF bit in
ADCSR is set to 1 after A/D conversion is completed.
The A/D converter can generate an A/D conversion end interrupt request. The ADI interrupt can
be enabled by setting the ADIE bit in the A/D control/status register (ADCSR) to 1, or disabled by
clearing the ADIE bit to 0.
Table 11.5 A/D Converter Interrupt Source
Name
ADI
Interrupt Source
A/D conversion completed
Interrupt Source Flag
ADF
11.6 Definitions of A/D Conversion Accuracy
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 11.5).
• 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'00) to
B'0000000001 (H'01) (see figure 11.6).
• 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 11.6).
• Nonlinearity error
The error with respect to the ideal A/D conversion characteristic between zero voltage and full-
scale voltage. Does not include offset error, full-scale error, or quantization error (see figure
11.6).
• Absolute accuracy
The deviation between the digital value and the analog input value. Includes offset error, full-
scale error, quantization error, and nonlinearity error.
Rev.2.00 Sep. 27, 2007 Page 338 of 448
REJ09B0394-0200