HD64F2168 Datasheet, PDF (644/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

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 enables ADI interrupt requests while the ADF bit in ADCSR is set to 1
after A/D conversion ends.
The ADI interrupt can be used as a DTC activation interrupt source.
Table 18.4 A/D Converter Interrupt Source
Name
ADI
Interrupt Source
A/D conversion end
Interrupt Flag
ADF
DTC Activation
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 18.4).
• 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'00 0000 0000 (H'000) to
B'00 0000 0001 (H'001) (see figure 18.5).
• 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'11 1111 1110 (H'3FE) to B'11 1111 1111 (H'3FF) (see
figure 18.5).
• 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 18.5).
• 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.
Rev. 3.00, 03/04, page 604 of 830