RL78/G1P
CHAPTER 9 A/D CONVERTER
R01UH0895EJ0100 Rev.1.00
282
Nov 29, 2019
9.6.12 Hardware trigger wait 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> If a hardware trigger is input while in the hardware trigger standby status, A/D conversion is performed on the
four analog input channels specified by scan 0 to scan 3, which are specified by the analog input channel
specification register (ADS). The ADCS bit of the ADM0 register is automatically set to 1 according to the
hardware trigger input. 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 ends, the ADCS bit is automatically cleared to 0, and the A/D converter enters the stop
status.
<5> If a hardware trigger is input 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 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.
<8> When ADCS is cleared to 0 during conversion operation, the current A/D conversion is interrupted, the system
enters the hardware trigger standby status, and the A/D converter enters the stop status. When ADCE = 0,
inputting a hardware trigger is ignored and A/D conversion does not start.
Figure 9-28. Example of Hardware Trigger Wait Mode (Scan Mode, One-Shot Conversion Mode) Operation Timing
<4>
Data 5
(ANI0)
Data 19
(ANI4)
ANI0 to ANI3
ADCS is cleared
to 0 during A/D
conversion
operation.
ADCE
Hardware
trigger
ADCS
ADS
A/D
conversion
status
ADCR,
ADCRH
INTAD
<1> ADCE is set to 1.
A hardware trigger
is generated.
A hardware trigger is
generated during A/D
conversion operation.
The trigger is not
acknowledged.
Conversion
standby
status
The trigger is not
acknowledged.
Trigger
standby
status
ADCS is automatically
cleared to 0 after
conversion ends.
ADCS is overwritten
with 1 during A/D
conversion operation.
ADS is rewritten
during A/D conversion
operation.
ANI4 to ANI7
Conversion is
interrupted
and restarts.
Stop status
Stop status
Stop
status
Stop
status
Stop
status
Data 1
(ANI0)
Data 1
(ANI0)
Data 5
(ANI0)
Data 11
(ANI0)
Data 11
(ANI0)
Data 2
(ANI1)
Data 2
(ANI1)
Data 6
(ANI1)
Data 12
(ANI1)
Data 3
(ANI2)
Data 3
(ANI2)
Data 9
(ANI2)
Data 8
(ANI1)
Data 7
(ANI0)
Data 9
(ANI2)
Data 8
(ANI1)
Data 4
(ANI3)
Data 10
(ANI3)
Data 10
(ANI3)
Data 13
(ANI4)
Data 13
(ANI4)
Data 17
(ANI4)
Data 19
(ANI4)
Data 14
(ANI5)
Data 14
(ANI5)
Data 18
(ANI5)
Data 21
(ANI6)
Data 20
(ANI5)
Data 20
(ANI5)
Data 15
(ANI6)
Data 15
(ANI6)
Data 16
(ANI7)
Data 16
(ANI7)
The interrupt is generated four times.
Data 4
(ANI3)
<5>
<2>
<2>
<2>
<2>
<4>
<4>
<4>
<7>
<8>
<6>
<4>
<3> A/D
conversion
ends.
Conversion is
interrupted
and restarts.
Conversion is
interrupted
and restarts.
Conversion is
interrupted.
The interrupt is generated four times.
The interrupt is generated four times.
Data 17
(ANI4)
Data 7
(ANI0)
A/D power supply
stabilization wait
A/D power supply
stabilization wait
A/D power supply
stabilization wait
A/D power supply
stabilization wait