RL78/G13 CHAPTER 11 A/D CONVERTER
R01UH0146EJ0100 Rev.1.00 517
Sep 22, 2011
11.6.11 Hardware trigger wait 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> 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. After A/D conversion of the four channels ends, the A/D
conversion of the channel following the specified channel automatically starts.
<4> 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.
<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> 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 11-30. Example of Hardware Trigger Wait Mode (Scan Mode, Sequential Conversion Mode) Operation
Timing
ADCE
ADCS
ADS
INTAD
ADCR,
ADCRH
A/D
conversion
status
ADCE is set to 1.
<1>
The trigger is not
acknowledged.
Stop status
Stop status
Data 1
(ANI0)
Data 1
(ANI0)
Data 2
(ANI1)
Data 2
(ANI1)
Data 3
(ANI2)
Data 3
(ANI2)
Data 4
(ANI3)
Data 1
(ANI0)
Data 2
(ANI1)
Data 6
(ANI5)
Data 6
(ANI5)
Data 6
(ANI5)
Data 6
(ANI5)
Data 5
(ANI4)
Data 5
(ANI4)
Data 5
(ANI4)
Data 5
(ANI4)
Data 5
(ANI4)
Data 5
(ANI4)
Data 5
(ANI4)
Data 6
(ANI5)
Data 6
(ANI5)
Data 2
(ANI1)
Data 3
(ANI2)
Data 3
(ANI2)
Data 4
(ANI3)
Data 1
(ANI0)
Data 4
(ANI3)
Data 8
(ANI7)
Data 8
(ANI7)
Data 8
(ANI7)
Data 8
(ANI7)
Data 7
(ANI6)
Data 7
(ANI6)
Data 7
(ANI6)
Data 7
(ANI6)
Data 4
(ANI3)
Data 1
(ANI0)
Data 1
(ANI0)
Data 2
(ANI1)
Data 2
(ANI1)
Data 7
(ANI6)
Conversion is
interrupted and restarts.
Conversion is
interrupted and restarts.
Conversion is
interrupted.
Conversion is
interrupted and restarts.
A/D conversion
ends and the next
conversion starts.
<3>
<3>
<3>
<3>
ADS is rewritten during
A/D conversion operation.
<5>
The interrupt is generated four times.
The interrupt is generated four times. The interrupt is generated four times. The interrupt is generated four times.
Trigger
standby status
Hardware
trigger
A hardware trigger
is generated.
<2>
A hardware trigger is
generated during A/D
conversion operation.
<4>
ADCS is overwritten
with 1 during A/D
conversion operation.
<6>
ADCS is cleared
to 0 during A/D
conversion operation.
Trigger
standby
status
<7>
The trigger
is not
acknowledged.
Data 1 (ANI0)
ANI0 to ANI3
ANI4 to ANI7
<R>
<R>
<R>
To Next Page
Loading...
Need help?
General
