Hi, Darrel and Jerson

CVRCON would be a good Idea ... but it is cleared at each power-up, and there's no asm ... other than DT Instant interrupts !

but the ADC still works ( it follows input, but as if a ghost divider was placed : for 3.4 v @ sensor input it "sees " 2.28v - confirmed by the voltmeter placed on the input pin )

Now, after a power down, the problem comes back , first times after ~ half an hour, then quicker and quicker ... and finally at power up and continuously.

if re-programming the device ... the problem still is here.

Note the problem only occurs after ~ 30 Hours of work ... whether the chip stays in sleep mode ( 400 Hours ) or powered down.

May be I should try another chip ... a 2580 i.e. ...

Alain