Software Trigger Mode (Scan Mode, One-Shot Conversion Mode) - Renesas RL78/G1P Hardware User Manual

RL78/G1P

9.6.4 Software trigger mode (scan mode, one-shot conversion mode)

<1> In the stop status, the ADCE bit of A/D converter mode register 0 (ADM0) is set to 1, and the system enters the
A/D conversion standby status.
<2> After the software counts up to the stabilization wait time
perform A/D conversion on the four analog input channels specified by scan 0 to scan 3, which are specified by
the analog input channel specification register (ADS). A/D conversion is performed on the analog input channels
in order, starting with that specified by scan 0.
<3> A/D conversion is sequentially performed on the four analog input channels, the conversion results are stored in
the A/D conversion result register (ADCR, ADCRH) each time conversion ends, and the A/D conversion end
interrupt request signal (INTAD) is generated.
<4> After A/D conversion of the four channels ends, the ADCS bit is automatically cleared to 0, and the system enters
the A/D conversion standby status.
<5> When ADCS is overwritten with 1 during conversion operation, the current A/D conversion is interrupted, and
conversion restarts at the first channel. The partially converted data is discarded.
<6> When the value of the ADS register is rewritten or overwritten during conversion operation, the current A/D
conversion is interrupted, and A/D conversion is performed on the first channel respecified by the ADS register.
The partially converted data is discarded.
<7> When ADCS is cleared to 0 during conversion operation, the current A/D conversion is interrupted, and the
system enters the A/D conversion standby status.
<8> When ADCE is cleared to 0 while in the A/D conversion standby status, the A/D converter enters the stop status.
When ADCE = 0, specifying 1 for ADCS is ignored and A/D conversion does not start.
conversion does not start even if a hardware trigger is input while in the A/D conversion standby status.
Note If a high-accuracy channel is selected as the analog input channel: Stabilization wait time = 0.5
If a standard channel is selected as the analog input channel:
Figure 9-20. Example of Software Trigger Mode (Scan Mode, One-Shot Conversion Mode) Operation Timing
<1> ADCE is set to 1.
ADCE
ADCS is set to 1 while
<2>
in the conversion
The trigger
standby status.
is not
acknowledged.
ADCS
ADS ANI0 to ANI3
A/D
Stop Data 1 Data 2
conversion Conversion
status (ANI0)
standby (ANI1)
status
ADCR,
Data 1
ADCRH
(ANI0)
INTAD
The interrupt is generated four times.
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
ADCS is
<4> <2> <5>
automatically
cleared to
0 after
conversion
ends.
A/D conversion
<3>
ends.
Data 3 Data 4 Conversion Data 5 Data 6
(ANI3) standby (ANI0) (ANI1)
(ANI2)
Data 2 Data 3 Data 4 Data 5
(ANI1) (ANI3) (ANI0)
(ANI2)
Note , the ADCS bit of the ADM0 register is set to 1 to
Stabilization wait time = 2
ADCS is overwritten
<4> <2>
with 1 during A/D
conversion operation.
Conversion is
<3>
interrupted and restarts.
Data 7 Data 8 Data 9 Data 10 Conversion Data 11
(ANI0) (ANI2) (ANI3) standby (ANI0)
(ANI1)
Data 7 Data 8 Data 9 Data 10
(ANI0) (ANI2) (ANI3)
(ANI1)
The interrupt is generated four times.
CHAPTER 9 A/D CONVERTER
In addition, A/D

s

s
ADCE is cleared to 0. <8>
ADCS is cleared
<7>
to 0 during A/D
conversion operation.
ADS is rewritten during
<6>
A/D conversion operation.
ANI4 to ANI7
Conversion is
interrupted and restarts.
Data 12 Data 13 Data 14 Data 15 Data 16
(ANI1) (ANI4) (ANI5) (ANI6)
(ANI7)
Data 11 Data 13 Data 14 Data 15
(ANI4) (ANI5)
(ANI0) (ANI6)
The trigger
is not
acknowledged.
Conversion is
interrupted.
Stop
Conversion
status
standby
274