R01UH0823EJ0100 Rev.1.00 Page 1595 of 1823
Jul 31, 2019
RX23W Group 44. 12-Bit A/D Converter (S12ADE)
The following describes the operations in group scan mode under group-A priority control (i.e. ADGSPCR.GBRSCN =
1 and ADGSPCR.GBRP = 0) when channel 0 is selected for group A and channels 1 to 3 are selected for group B.
(1) When input of a trigger for group B sets the ADCSR.ADST bit to 1 (A/D conversion start), conversion for the ANn
channels selected in the ADANSB0 and ADANSB1 registers, starting from the channel with the smallest number n.
(2) On completion of A/D conversion, the result is stored in the corresponding A/D data register (ADDRy).
(3) The ADCSR.ADST bit is cleared on the input of a trigger for group A while operation for A/D conversion in group
B is in progress, and the latter is discontinued. After that, the ADCSR.ADST bit is set to 1 (A/D conversion start),
and conversion for the ANn channels selected in the ADANSA0 and ADANSA1 registers, starting from the channel
with the smallest number n.
(4) On completion of A/D conversion on a single channel, the result is stored in the corresponding A/D data register
(ADDRy).
(5) An S12ADI0 interrupt request is generated if the setting of the ADCSR.ADIE bit is 1 (S12ADI0 interrupt upon
scanning completion enabled).
(6) After the ADST bit is automatically cleared, again, the bit is automatically set to 1 (A/D conversion start) and
conversion for the ANn channels of group B selected in the ADANSB0 and ADANSB1 registers, starting from the
channel with the smallest number n.
(7) On completion of A/D conversion on a single channel, the result is stored in the corresponding A/D data register
(ADDRy).
(8) A GBADI interrupt request is generated if the setting of the ADCSR.GBADIE bit is 1 (GBADI interrupt upon
group B scanning completion enabled).
(9) The ADST bit remains 1 (A/D conversion start) during A/D conversion and is automatically cleared on completion
of conversion, after which the A/D converter enters a wait state.
Table 44.9 Control of A/D Conversion Operations According to the Settings of the ADGSPCR.GBRSCN Bit
A/D Conversion Operation Trigger Input ADGSPCR.GBRSCN = 0 ADGSPCR.GBRSCN = 1
When A/D conversion for
group A is in progress
Input of trigger for group A Trigger input is ineffective. Trigger input is ineffective.
Input of trigger for group B Trigger input is ineffective. A/D conversion is performed on
group B after A/D conversion on
group A is completed.
When A/D conversion for
group B is in progress
Input of trigger for group A Conversion for group B that is in
progress is discontinued and
conversion for group A starts.
Conversion in progress for
group B is discontinued and
conversion for group A starts.
Conversion for group B starts
after conversion for group A is
completed.
Input of trigger for group B Trigger input is ineffective. Trigger input is ineffective.
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