RL78/D1A User's Manual: Hardware - Renesas

Under development
Preliminary document
Specifications in this document are tentative and subject to change.
RL78/D1A CHAPTER 11 A/D CONVERTER
11.6.2 Software trigger mode (select mode, one-shot conversion mode)
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.
After the software counts up to the stabilization wait time (1 s), the ADCS bit of the ADM0 register is set to 1 to
perform the A/D conversion of the analog input specified by the analog input channel specification register (ADS).
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 ADCS bit is automatically cleared to 0, and the system enters the A/D conversion
standby status.
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.
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.
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.
When ADCE is cleared to 0 while in the A/D conversion standby status, the A/D converter enters the stop status.
When ADCE = 0, specifying 1 for ADCS is ignored and A/D conversion does not start. In addition, A/D
conversion does not start even if a hardware trigger is input while in the A/D conversion standby status.
Figure 11-20. Example of Software Trigger Mode (Select Mode, One-Shot Conversion Mode) Operation Timing
A/D
conversion
status
ADCR,
ADCRH
INTAD
ADCE is set to 1.
Data 0
(ANI0)
ADCE is cleared to 0.
ADCE
The trigger
is not
acknowledged.
ADCS
ADCS is set to ADCS is
1 while in the automatically
conversion cleared to
standby status.
0 after
conversion
ends.
ADCS is overwritten
with 1 during A/D
conversion operation.
ADS is rewritten during
A/D conversion operation
(from ANI0 to ANI1).
ADCS is
cleared to
0 during A/D
conversion
operation.
ADS
Data 0
(ANI0)
Data 1
(ANI1)
A/D
conversion
ends.
Conversion is
interrupted
and restarts.
Conversion is
interrupted.
Stop Conversion
status standby
Data 0
(ANI0)
Conversion
standby
Data 0
(ANI0)
Data 0
(ANI0)
Conversion
standby
Data 0
(ANI0)
Data 1
(ANI1)
Conversion
standby
Data 1
(ANI1)
Conversion
standby
Stop
status
The trigger
is not
acknowledged.
R01UH0317EJ0004 Rev. 0.04 532
Feb. 22, 2013
Data 0
(ANI0)
Data 1
(ANI1)