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CHAPTER 18 8-/10-BIT A/D CONVERTER
Figure 18.5-5 Processing Flow of A/D Conversion Data Protection Function when Using EI
2
OS
Notes:
• The A/D conversion data protection function is activated only when an interrupt request is enabled. Set
the interrupt request enable bit in the A/D control status register (ADCS:INTE) to 1.
•The EI
2
OS function is used to transfer the A/D conversion results to memory, do not disable output of an
interrupt request. If output of an interrupt request is disabled during a pause of A/D conversion
(ADCS:INTE = 0), A/D conversion may be restarted to rewrite data being transferred.
•The EI
2
OS function is used to transfer the A/D conversion results to memory, do not restart. Restarting
during a pause of A/D conversion may cause loss of the A/D conversion results.
EI
2
OS set
A/D continuous conversion
starts
First conversion terminates
Data in A/D data register stored
Second conversion terminates EI
2
OS starts
Note: The operation flow of when
the A/D converter is stopped is omitted.
Data in A/D data register stored
Third conversion
Entire conversion terminates
End
EI
2
OS end A/D pauses
EI
2
OS starts
A/D conversion pauses
NO
YES
EI
2
OS terminates A/D pauses
NO
YES
Interrupt processing
Continued
EI
2
OS starts