RX610 Group
23. A/D Converter
R01UH0032EJ0120 Rev.1.20
Page 799 of 1006
Feb 20, 2013
23.4
Interrupt Source
The A/D converter generates an A/D conversion end interrupt (ADI) at the end of A/D conversion while the ADIE bit in
ADCSR is set to 1 (after ADI interrupt is enabled by completing A/D conversion).
The data transfer controller (DTC) and DMA controller (DMAC) can be activated by an ADI interrupt. Having the
converted data read by the DTC or DMAC in response to an ADI interrupt enables continuous conversion to be achieved
without imposing a load on software.
Table 23.8 A/D Converter Interrupt Source
Name
Interrupt Source
Interrupt Status Flag
DTC Activation
DMAC Activation
ADI0
A/D conversion end
ICU.IR98.IR
Possible
Possible
ADI1
A/D conversion end
ICU.IR99.IR
Possible
Possible
ADI2
A/D conversion end
ICU.IR100.IR
Possible
Possible
ADI3
A/D conversion end
ICU.IR101.IR
Possible
Possible
23.5
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 23.13)
•
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 0000000000b (000h) to 0000000001b (001h) (see figure 23.14)
•
Full-scale error
The deviation of the analog input voltage value from the ideal A/D conversion characteristic when the digital output
changes from 1111111110b (3FEh) to 1111111111b (3FFh) (see figure 23.14)
•
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 23.14).
•
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.
Summary of Contents for RX600 Series
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