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Chapter 14
A/D Converter
User’s Manual U16580EE3V1UD00
14.6 Operation in Timer Trigger Mode
In this mode, the conversion timing of the analog input signal set by the ANIn0 to ANIn9 pins is defined
by a timer event signal (A/D converter trigger signal, or top and bottom reversal interrupt) of the inverter
timers R0 and R1 (TMR0, TMR1).
The analog input conversion timing is generated when an A/D converter trigger signal from the timers
(TR0ADTRG0, TR0ADTRG1, TR1ADTRG0, TR1ADTRG1), or a top or bottom reversal interrupt
(INTTR0CD, INTR0OD, INTTR1CD, INTTR1OD) is generated by inverter timer R0 or R1 (TMR0 or
TMR1).
When the ADCEn bit of the ADMn0 register is set to 1, the A/D converter waits for the signal
(TR0ADTRG0, TR0ADTRG1, TR1ADTRG0, TR1ADTRG1) or interrupt (INTTR0CD, INTR0OD,
INTTR1CD, INTTR1OD), and starts conversion when the timer event occurs (ADCSn bit of the ADMn0
register = 1). When conversion is finished, the converter waits for a timer event signal again (ADCSn bit
= 0).
If the timer event signal occurs during conversion, the conversion operation is executed from the
beginning again.
If data is written to the ADMn0 to ADMn2 registers during conversion, the conversion operation is
stopped and executed from the beginning again.
14.6.1 Select mode operation
In this mode, an analog input (ANIn0 to ANIn9) specified by the ADMn2 register is A/D converted. The
conversion results are stored in the ADCRnm register corresponding to the analog input. In the select
mode, the 1-buffer mode and 4-buffer mode are provided according to the storing method of the A/D
conversion results.
(1)
1-buffer mode operation (timer trigger select: 1 buffer)
In this mode, one analog input is A/D converted once and the conversion results are stored in one
ADCRnm register.
One analog input is A/D converted once using the trigger of the timer event signals (TR0ADTRG0,
TR0ADTRG1, TR1ADTRG0, TR1ADTRG1, INTTR0CD, INTR0OD, INTTR1CD, INTTR1OD) and
the results are stored in one ADCRnm register. An A/D conversion end interrupt (INTADn) is gen-
erated for each A/D conversion.
Unless the ADCEn bit of the ADMn0 register is cleared to 0, A/D conversion is repeated each time
a timer event signal is generated.
Содержание V850E/PH2
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