CHAPTER 13 A/D CONVERTER
Page 310 of 920
13.6.5
Hardware trigger wait mode (select 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 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. After
A/D conversion ends, the next A/D conversion immediately starts. (At this time, no hardware trigger
is necessary.)
<4> 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.
<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 analog input
respecified by the ADS register. The partially converted data is discarded.
<6> When ADCS is overwritten with 1 during conversion operation, the current A/D conversion is
interrupted, and conversion restarts. The partially converted data is discarded.
<7> 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 - 22 Example of Hardware Trigger Wait Mode (Select Mode, Sequential Conversion Mode) Operation
Timing
A/D conversion ends
and the next
conversion
starts.
ADCE
Hardware
trigger
ADCS
ADS
A/D conversion
status
ADCR,
ADCRH
INTAD
<1> ADCE is set to 1.
<2>
<4> A hardware trigger is
generated during A/D
conversion operation.
The trigger is not
acknowledged.
ANI0
ANI1
ADCS is cleared
to 0 during A/D
conversion operation.
ADCS is overwritten
with 1 during A/D
conversion operation.
ADS is rewritten during
A/D conversion operation
(from ANI0 to ANI1).
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.
Data 1
(ANI0)
Data 2
(ANI0)
Data 1
(ANI0)
Data 3
(ANI0)
Data 2
(ANI0)
Data 4
(ANI0)
Data 5
(ANI0)
Data 4
(ANI0)
Data 6
(ANI1)
Data 6
(ANI1)
Data 7
(ANI1)
Data 8
(ANI1)
Data 9
(ANI1)
Data 8
(ANI1)
Conversion
stops
Conversion
stops
<6>
<7>
<5>
<3>
<3>
<3>
<3>
<3>
A hardware trigger
is generated.
Conversion
standby
Conversion
standby
Conversion starts + Wait for
A/D power supply stabilization
The trigger is not
acknowledged.
Содержание RL78/G1H
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