SLAZ682L February   2017  – August 2021 MSP430FR5964

 

  1.   1
  2.   2
  3.   3
  4.   4
  5.   5
    1.     6
    2.     7
      1.      8
      2.      9
      3.      10
      4.      11
    3.     12
  6.   13
    1.     14
    2.     15
    3.     16
    4.     17
    5.     18
    6.     19
    7.     20
    8.     21
    9.     22
    10.     23
    11.     24
    12.     25
    13.     26
    14.     27
    15.     28
    16.     29
    17.     30
    18.     31
    19.     32
    20.     33
  7.   34

ADC69

ADC Module

Category

Functional

Function

ADC stops operating if ADC clock source is changed from SMCLK to another source while SMCLKOFF = 1.

Description

When SMCLK is used as the clock source for the ADC (ADC12CTL1.ADC12SSELx = 11) and CSCTL4.SMCLKOFF = 1, the ADC will stop operating if the ADC clock source is changed by user software (e.g. in the ISR) from SMCLK to a different clock source. This issue appears only for the ADC12CTL1.ADC12DIVx settings /3/5/7. The hang state can be recovered by PUC/POR/BOR/Power cycle.

Workaround

1. Set CSCTL4.SMCLKOFF = 0 before switch ADC clock source.

OR

2. Only use ADC12CTL1.ADC12DIVx as /1, /2, /4, /6, /8