CHAPTER 13 A/D CONVERTER
Page 311 of 920
13.6.6
Hardware trigger wait mode (select 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 hardware trigger standby status.
<2> If a hardware trigger is input while in the hardware trigger standby status, A/D conversion is
performed on the analog input 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.
<3> When A/D conversion ends, the conversion result is stored in the A/D conversion result register
(ADCR, ADCRH), 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. 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 analog input
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. The partially converted data is initialized.
<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 13 - 23 Example of Hardware Trigger Wait Mode (Select Mode, One-Shot Conversion Mode) Operation
Timing
ADS is rewritten during
A/D conversion
operation
(from ANI0 to ANI1).
ADCE
Hardware
trigger
ADCS
ADS
A/D conversion
status
ADCR,
ADCRH
INTAD
<1> ADCE is set to 1.
A hardware trigger
is generated.
<2>
A hardware trigger is
generated during A/D
conversion operation.
The trigger is not
acknowledged.
ADCS is automatically
cleared to 0 after
conversion ends.
ADCS is overwritten
with 1 during A/D
conversion operation.
<6>
Conversion is
interrupted.
Conversion is
interrupted
and restarts.
Conversion is
interrupted
and restarts.
Conversion is
Interrupted and
restarts after the
conversion start time
has elapsed.
A/D conversion
ends.
Conversion
stops
Data 1
(ANI0)
Conversion
standby
Data 2
(ANI0)
Data 3
(ANI0)
Data 4
(ANI0)
Data 5
(ANI1)
Data 6
(ANI1)
Data 7
(ANI1)
Data 8
(ANI1)
Conversion
standby
Conversion
standby
Conversion
standby
Conversion
stops
Data 1
(ANI0)
Data 3
(ANI0)
Data 5
(ANI1)
Data 7
(ANI1)
ANI0
ANI1
<2>
<2>
<2>
<2>
<4>
<7>
<4>
<4>
<4>
<3>
<3>
<3>
<3>
<5>
Conversion starts + Wait for
A/D power supply stabilization
Conversion
standby
Conversion starts + Wait for A/D power
supply stabilization
Conversion starts + Wait for A/D
power supply stabilization
Conversion starts + Wait for A/D
power supply stabilization
Conversion starts + Wait for A/D
power supply stabilization
Standby
status
Trigger
standby
status
Trigger
standby
status
Trigger
standby
status
Trigger
standby
status
ADCS is cleared
to 0 during A/D
conversion operation.
<8>
The trigger is not
acknowledged.
Содержание RL78/G1H
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