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

RL78/G1P

9.6.3 Software trigger mode (scan mode, sequential 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.
conversion of the channel following the specified channel automatically starts (until all four channels are finished).
<4> 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.
<5> 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.
<6> Even if a hardware trigger is input during conversion operation, A/D conversion does not start.
<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.
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 9-19. Example of Software Trigger Mode (Scan Mode, Sequential Conversion Mode) Operation Timing
<1> ADCE is set to 1.
ADCE
<2> ADCS is set to 1 while in the
The trigger
conversion standby status.
is not
acknowledged.
ADCS
ADS ANI0 to ANI3
A/D conversion ends and
the next conversion starts.
A/D
Data 1
Stop
Conversion
conversion
status (ANI0)
standby
status
ADCR,
ADCRH
INTAD
The interrupt is generated four times.
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
ADCS is overwritten with
<4>
1 during A/D conversion
operation.
<3>
Conversion is
interrupted and restarts.
Data 5 Data 6
Data 2 Data 3 Data 4 Data 7
(ANI0) (ANI1) (ANI0)
(ANI1) (ANI2) (ANI3)
Data 2 Data 4
Data 1 Data 3 Data 5
(ANI1) (ANI3) (ANI0)
(ANI0) (ANI2)
The interrupt is generated four times.
Note , the ADCS bit of the ADM0 register is set to 1 to
After A/D conversion of the four channels ends, the A/D
Stabilization wait time = 2
A hardware trigger is
generated (and ignored).
<5> ADS is rewritten during
A/D conversion operation.
ANI4 to ANI7
<3>
Conversion is
interrupted and restarts.
Data 8 Data 9 Data 10 Data 11 Data 13
Data 12
(ANI4)
(ANI1) (ANI2) (ANI3) (ANI0) (ANI1)
Data 9
Data 7 Data 8 Data 10 Data 11
(ANI0) (ANI1) (ANI2) (ANI3)
(ANI0)
The interrupt is generated four times.
CHAPTER 9 A/D CONVERTER

s

s
ADCE is cleared to 0. <8>
ADCS is cleared
<6> <7>
to 0 during A/D
conversion operation.
<3>
Conversion is
interrupted.
Data 14 Data 15 Data 16 Data 17 Data 18 Conversion
(ANI5) (ANI4) (ANI5) standby
(ANI6) (ANI7)
Data 13 Data 14 Data 15 Data 16 Data 17
(ANI4) (ANI5)
(ANI6) (ANI7) (ANI4)
The trigger
is not
acknowledged.
Stop
status
273