SLAZ323AD October   2012  – September 2021 MSP430F5638

 

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6.1 ADC25

ADC Module

Category

Functional

Function

Write to ADC12CTL0 triggers ADC12 when CONSEQ = 00

Description

If ADC conversions are triggered by the Timer_B module and the ADC12 is in single-channel single-conversion mode (CONSEQ = 00), ADC sampling is enabled by write access to any bit(s) in the ADC12CTL0 register. This is contrary to the expected behavior that only the ADC12 enable conversion bit (ADC12ENC) triggers a new ADC12 sample.

Workaround

When operating the ADC12 in CONSEQ=00 and a Timer_B output is selected as the sample and hold source, temporarily clear the ADC12ENC bit before writing to other bits in the ADC12CTL0 register. The following capture trigger can then be re-enabled by setting ADC12ENC = 1.