R01UH0823EJ0100 Rev.1.00 Page 1558 of 1823
Jul 31, 2019
RX23W Group 44. 12-Bit A/D Converter (S12ADE)
44.2.17 A/D Group Scan Priority Control Register (ADGSPCR)
Note 1. When the PGS bit is to be set to 1, the ADCSR.ADCS[1:0] bits must be set to 01b (group scan mode). If the bits are set to any
other values, proper operation is not guaranteed.
Note 2. When the GBRSCN bit is to be set to 1, the frequency ratio of peripheral module clock PCLK to A/D conversion clock ADCLK
should be set to 1:1.
Note 3. When the GBRP bit has been set to 1, single scan is performed continuously for group B regardless of the setting of the
GBRSCN bit.
ADGSPCR is used to make settings for priority control of A/D conversion for group A in group scan mode.
PGS Bit (Group-A Priority Control Setting)
This bit sets the priority of operation on group A. Set this bit to 1 when giving priority to operation on group A.
When the PGS bit is to be set to 1, the ADCSR.ADCS[1:0] bits must be set to 01b (group scan mode).
When setting the PGS bit to 0, clearing should be performed by software according to
section 44.8.2, Notes on
Stopping A/D Conversion
. When setting the PGS bit to 1, follow the procedure described in section 44.3.4.3,
Operation under Group-A Priority Control
.
GBRSCN Bit (Group B Restart Setting)
This bit controls the restarting of scan operation on group B when operation on group A is given priority.
If a scan operation on group B has been stopped by a group A trigger input with the GBRSCN bit set to 1, the scan
operation is restarted on completion of the A/D conversion on group A. Also, if a group B trigger is input during A/D
conversion on group A, the scan operation on group B is restarted on completion of the A/D conversion on group A.
If the GBRSCN bit has been set to 0, triggers that are input during A/D conversion are ignored. Also, the ADCSR.ADST
bit must be 0 when the GBRSCN bit is to be set.
The setting of the GBRSCN bit is enabled when the PGS bit is set to 1.
GBRP Bit (Group B Single Scan Continuous Start)
This bit is set when a single scan operation is to be performed continuously on group B.
Setting the GBRP bit to 1 starts a single scan on group B. On completion of the scan, another single scan on group B is
automatically started. If an A/D conversion on group B has been stopped due to an operation on group A that takes
priority, single scan on group B is automatically restarted on completion of the A/D conversion on group A.
Disable group B trigger input before setting the GBRP bit to 1. Setting the GBRP bit to 1 invalidates the setting of the
Address(es): S12AD.ADGSPCR 0008 9080h
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
GBRP—————————————
GBRSC
N
PGS
Value after reset:
0000000000000000
Bit Symbol Bit Name Description R/W
b0 PGS Group-A Priority
Control Setting
*
1
0: Operation is without group-A priority control
1: Operation is with group-A priority control
R/W
b1 GBRSCN Group B Restart
Setting
*
2
(Enabled only when PGS = 1. Reserved when PGS = 0.)
0: Scanning for group B is not restarted after having been discontinued due
to group-A priority control.
1: Scanning for group B is restarted after having been discontinued due to
group-A priority control.
R/W
b14 to b2 — Reserved These bits are read as 0. The write value should be 0. R/W
b15 GBRP Group B Single Scan
Continuous Start
*
3
(Enabled only when PGS = 1. Reserved when PGS = 0.)
0: Single scan for group B is not continuously activated.
1: Single scan for group B is continuously activated.
R/W
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