SLAZ617AA August   2014  – August 2021 MSP430FR6927

 

  1.   1
  2.   2
  3.   3
  4.   4
  5.   5
    1.     6
    2.     7
      1.      8
      2.      9
    3.     10
  6.   11
    1.     12
    2.     13
    3.     14
    4.     15
    5.     16
    6.     17
    7.     18
    8.     19
    9.     20
    10.     21
    11.     22
    12.     23
    13.     24
    14.     25
    15.     26
    16.     27
    17.     28
    18.     29
    19.     30
    20.     31
    21.     32
    22.     33
    23.     34
    24.     35
    25.     36
    26.     37
    27.     38
    28.     39
    29.     40
    30.     41
    31.     42
    32.     43
    33.     44
    34.     45
    35.     46
    36.     47
    37.     48
    38.     49
    39.     50
    40.     51
    41.     52
    42.     53
    43.     54
    44.     55
    45.     56
    46.     57
    47.     58
  7.   59

6.37 PORT28

PORT Module

Category

Functional

Function

Pull-down resistor of TEST/SBWTCK pin

Description

The device's internal pull-down resistor on the TEST/SBWTCK pin gets disabled if the SYS control bit SFRRPCR.SYSRSTRE is cleared. This can lead to increased current consumption and unintentionally-enabled JTAG access to the device.

Workaround

1) Do not clear the SFRRPCR.SYSRSTRE bit, use the SFRRPCR.SYSRSTRUP bit to define direction of the internal resistor on RST/NMI/SBWTDIO pin instead.

OR

2) Ensure a zero voltage level of TEST/SBWTCK pin by connecting the pin to an external component (e.g. external pull-down resistor) on the PCB.