SLAZ359G October   2012  – May 2021 MSP430FE427A

 

  1. 1Functional Advisories
  2. 2Preprogrammed Software Advisories
  3. 3Debug Only Advisories
  4. 4Fixed by Compiler Advisories
  5. 5Nomenclature, Package Symbolization, and Revision Identification
    1. 5.1 Device Nomenclature
    2. 5.2 Package Markings
      1.      PM64
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  CPU4
    2. 6.2  EEM20
    3. 6.3  ESP1
    4. 6.4  ESP4
    5. 6.5  FLL3
    6. 6.6  TA12
    7. 6.7  TA16
    8. 6.8  TA21
    9. 6.9  TAB22
    10. 6.10 US15
    11. 6.11 WDG2
  7. 7Revision History

6.4 ESP4

ESP Module

Category

Functional

Function

Suspending the ESP430 activity

Description

Due to timing violations between the ESP CPU and the MSP430 CPU, the SD16 converters are not switched off correctly if the ESP CPU is set into suspend mode immediately after the ESP CPU is checked for idle mode. This leads to an higher current consumption in low-power modes.

Workaround

Implement an additional wait loop of 16 clock cycles between checking the ESP for idle mode and set the ESP CPU into suspend mode.

while ((RET0 & 0x8000) != 0); // Wait for Idle mode
// wait 16 clocks to exclude timing violations between MSP430 CPU
// and ESP CPU
_NOP();_NOP();_NOP();_NOP();_NOP();_NOP();_NOP();_NOP();_NOP();--
_NOP();_NOP();_NOP();_NOP();_NOP();_NOP();_NOP();
// Shut down ESP (set Embedded Signal Processing into "Suspend" mode)
// ensure that it is not in measurement or calibration mode,
if ((RET0 & 0x8000) == 0)
{
ESPCTL |= 0x08 + ESPSUSP; // Set ESP into Suspend Mode
// incl. Bug Fix for Suspend Mode
}