CHAPTER 13 A/D CONVERTER
Page 308 of 920
13.6.3
Hardware trigger no-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 A/D conversion standby status.
<2> After the software counts up to the stabilization wait time (1
μ
s), the ADCS bit of the ADM0 register is
set to 1 to place the system in the hardware trigger standby status (and conversion does not start at
this stage). Note that, while in this status, A/D conversion does not start even if ADCS is set to 1.
<3> If a hardware trigger is input while ADCS = 1, A/D conversion is performed on the analog input
specified by the analog input channel specification register (ADS).
<4> 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.
<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 discarded.
<8> 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. However, the A/D converter does not stop
in this status.
<9> When ADCE is cleared to 0 while in the A/D conversion standby status, the A/D converter enters the
stop status. When ADCS = 0, inputting a hardware trigger is ignored and A/D conversion does not
start.
Figure 13 - 20 Example of Hardware Trigger No-Wait Mode (Select Mode, Sequential Conversion Mode) Operation
Timing
Conversion
standby
ANI0
<3> A hardware trigger is
generated.
ADCE
Hardware
trigger
ADCS
ADS
A/D
conversion
status
ADCR,
ADCRH
INTAD
The trigger is not
acknowledged.
Trigger
standby
status
ADCS is overwritten
with 1 during A/D
conversion operation.
ANI1
Conversion
stops
Data 1
(ANI0)
Data 2
(ANI0)
Data 3
(ANI0)
Data 4
(ANI0)
Data 5
(ANI0)
Data 1
(ANI0)
Data 2
(ANI0)
Data 4
(ANI0)
Data 6
(ANI1)
Data 7
(ANI1)
Data 8
(ANI1)
Data 9
(ANI1)
Data 6
(ANI1)
Data 8
(ANI1)
Conversion
stops
Conversion
standby
Conversion is activated
The trigger is not
acknowledged.
ADCS is cleared
to 0 during A/D
conversion operation.
<1> ADCE is set to 1.
<2> ADCS is set to 1.
A hardware trigger is
generated during A/D
conversion operation.
<5>
ADCE is cleared to 0. <9>
<8>
<7>
<6>
ADS is rewritten during
A/D conversion operation
(from ANI0 to ANI1).
<4>
<4>
<4>
<4>
Conversion is
interrupted and
restarts.
Conversion is
interrupted and
restarts.
Conversion is interrupted
and restarts after the
conversion start time has
elapsed.
Conversion is
interrupted.
<4>
A/D conversion ends
and the next conversion
starts.
Trigger
standby
Содержание RL78/G1H
Страница 941: ...R01UH0575EJ0120 RL78 G1H...