6 Advisory Descriptions
ADC39
ADC Module
Category
Functional
Function
Erroneous ADC10 results in extended sample mode
Description
If the extended sample mode is selected (ADC10SHP = 0) and the ADC10CLK is
asynchronous to the SHI signal, the ADC10 may generate erroneous results.
Workaround
1) Use the pulse sample mode (ADC10SHP=1)
OR
2) Use a synchronous clock for ADC10 and the SHI signal.
ADC42
ADC Module
Category
Functional
Function
ADC stops converting when successive ADC is triggered before the previous conversion
ends
Description
Subsequent ADC conversions are halted if a new ADC conversion is triggered while ADC
is busy. ADC conversions are triggered manually or by a timer. The affected ADC modes
are:
- sequence-of-channels
- repeat-single-channel
- repeat-sequence-of-channels (ADC12CTL1.ADC12CONSEQx)
In addition, the timer overflow flag cannot be used to detect an overflow
(ADC12IFGR2.ADC12TOVIFG).
Workaround
1. For manual trigger mode (ADC12CTL0.ADC12SC), ensure each ADC conversion
is completed by first checking ADC12CTL1.ADC12BUSY bit before starting a new
conversion.
2. For timer trigger mode (ADC12CTL1.ADC12SHP), ensure the timer period is greater
than the ADC sample and conversion time.
To recover the conversion halt:
1. Disable ADC module (ADC12CTL0.ADC12ENC = 0 and ADC12CTL0.ADC12ON = 0)
2. Re-enable ADC module (ADC12CTL0.ADC12ON = 1 and ADC12CTL0.ADC12ENC =
1)
3. Re-enable conversion
ADC69
ADC Module
Category
Functional
Function
ADC stops operating if ADC clock source is changed from SMCLK to another source
while SMCLKOFF = 1.
Advisory Descriptions
6
MSP430F6769 Microcontroller
SLAZ479AD – DECEMBER 2012 – REVISED MAY 2021
Copyright © 2021 Texas Instruments Incorporated
