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Figure 18.6-4 Operation Flowchart of the Data Protection Function when EI
Note: The steps while the A/D converter is halted are omitted.
Notes:
• The conversion data protection function operates only in the interrupt enabled state (ADCS1:
INTE = 1).
• If interrupts are disabled during a pause in A/D conversion while EI
conversion may start again. This will cause new data to be written before the old data is
transferred. Reactivation attempted during a pause will cause the old data to be destroyed.
• Reactivation attempted during a pause will destroy the standby data.
2
Set EI
OS
Start continuous A/D
conversion
End first conversion
Store data in the data
register
End second conversion
NO
Has EI
2
OS
ended?
YES
Store data in the data
register
Third conversion
Continue
Terminate all conversions
Continue
Store data in the data
register
CHAPTER 18 8/10-BIT A/D CONVERTER
2
2
Activate EI
OS
Halt A/D
Activate EI
2
OS
2
Activate EI
OS
Interrupt processing routine
Initialize or stop A/D
End
2
OS is Used
OS is operating, A/D
299
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