Renesas RX100 Series User Manual page 817

RX13T Group
ADCS[1:0] Bits (Scan Mode Select)
The ADCS[1:0] bits select the scan mode.
In single scan mode, A/D conversion is performed for the analog inputs selected with the ADANSA0 register in the
ascending order of the channel number, and when one cycle of A/D conversion is completed for all the selected channels,
the scan conversion is stopped.
In continuous scan mode, while the ADCSR.ADST bit is 1, A/D conversion is performed for the analog inputs selected
with the ADANSA0 register in the ascending order of the channel number, and when one cycle of A/D conversion is
completed for all the selected channels, A/D conversion is repeated from the first channel. If the ADCSR.ADST bit is set
to 0 during continuous scan, A/D conversion is stopped even if scanning is in progress.
In group scan mode, A/D conversion is performed for the analog inputs (group A) selected with the ADANSA0 register
in the ascending order of the channel number after scanning is started by the synchronous trigger selected by the
ADSTRGR.TRSA[5:0] bits, and when one cycle of A/D conversion is completed for all the selected channels, A/D
conversion is stopped. A/D conversion is also performed for the analog inputs (group B or C) selected with the
ADANSB0 register and the ADANSC0 register in the ascending order of the channel number after A/D conversion is
started by the synchronous trigger selected by the ADSTRGR.TRSB[5:0] bits and ADGCTRGR.TRSC[5:0] bits, and
when A/D conversion is completed for all the selected channels, A/D conversion is stopped.
When selecting group scan mode, different channels and triggers should be selected for groups A, B, and C.
When using two groups while group scan mode is set, use groups A and B (ADGCTRGR.GRCE bit = 0). When using
three groups, use groups A, B, and C (ADGCTRGR.GRCE bit = 1).
When selecting the internal reference voltage, select single scan mode, and deselect all the channels selected with the
ADANSA0 register before performing A/D conversion. When A/D conversion of the selected internal reference voltage
is completed, A/D conversion is stopped.
The ADCS[1:0] bits should be set while the ADST bit is 0. They should not be set simultaneously when 1 is written to
the ADST bit.
ADST Bit (A/D Conversion Start)
The ADST bit starts or stops A/D conversion process.
Before the ADST bit is set to 1, set the A/D conversion clock, the conversion mode, and conversion target analog input.
[Setting conditions]
 1 is written by software.
 The synchronous trigger selected by the ADSTRGR.TRSA[5:0] bits is detected with ADCSR.EXTRG and
ADCSR.TRGE bits being set to 0 and 1, respectively.
 The synchronous trigger selected by the ADSTRGR.TRSB[5:0] bits is detected with the ADCSR.TRGE bit being
set to 1 in group scan mode.
 The asynchronous trigger is detected with the ADCSR.TRGE and ADCSR.EXTRG bits being set to 1 and the
ADSTRGR.TRSA[5:0] bits being set to 000000b.
 With group priority control operation mode enabled (ADCSR.ADCS[1:0] bits = 01b and ADGSPCR.PGS bit = 1),
a group B or C trigger is detected and A/D conversion of group B or C is started.
 With group priority control operation mode enabled (ADCSR.ADCS[1:0] bits = 01b and ADGSPCR.PGS bit = 1),
the ADGSPCR.GBRSCN bit is set to 1 and A/D conversion of group B or C is restarted.
 With group priority control operation mode enabled (ADCSR.ADCS[1:0] bits = 01b and ADGSPCR.PGS bit = 1),
the ADGSPCR.GBRP bit is set to 1 and A/D conversion of the lowest-priority group is started.
[Clearing conditions]
 0 is written by software.
 The A/D conversion of all the selected channels or the internal reference voltage is completed in single scan mode.
 Group A scan is completed in group scan mode.
 Group B scan is completed in group scan mode.
 Group C scan is completed in group scan mode.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
26. 12-Bit A/D Converter (S12ADF)
Page 817 of 1041