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User’s Manual U11969EJ3V0UM00
CHAPTER 9 A/D CONVERTER
9.7.2 Scan mode operation (External trigger scan)
The analog inputs from ANI0/ANI8 to the analog input specified with the ADM0 register are selected sequentially
and converted to digital when triggered by the ADTRG signal. The A/D conversion results are stored in the ADCRn
register corresponding to the analog input (refer to Table 9-9, Figure 9-14). When the conversion of all the specified
analog inputs ends, the INTAD interrupt is generated and A/D conversion is ended.
While the CE bit of the ADM0 register is 1, A/D conversion is restarted every time a trigger is input from the ADTRG
pin.
This mode is suitable for applications which always monitor two or more analog inputs.
Table 9-9. Correspondence between Analog Input Pin and ADCRn Register
(scan mode (external trigger scan))
Trigger
Analog Input
A/D Conversion
Results Register
ADTRG signal
ANI0/ANI8
ADCR0
ADTRG signal
ANI1/ANI9
ADCR1
ADTRG signal
ANI2/ANI10
ADCR2
ADTRG signal
ANI3/ANI11
ADCR3
ADTRG signal
ANI4/ANI12
ADCR4
ADTRG signal
ANI5/ANI13
ADCR5
ADTRG signal
ANI6/ANI14
ADCR6
ADTRG signal
ANI7/ANI15
ADCR7
Figure 9-14. Example of Scan Mode (external trigger scan) Operation
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
ANI8
ANI9
ANI10
ANI11
ANI12
ANI13
ANI14
ANI15
ADCR0
ADCR1
ADCR2
ADCR3
ADCR4
ADCR5
ADCR6
ADCR7
A/D Converter
ADTRG
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