SLAA419C October   2009  – April 2019 MSP430F5418 , MSP430F5418A , MSP430F5419 , MSP430F5419A , MSP430F5435 , MSP430F5435A , MSP430F5436 , MSP430F5436A , MSP430F5437 , MSP430F5437A , MSP430F5438 , MSP430F5438A

 

  1.   Migrating From MSP430F541x and MSP430F543x MCUs to MSP430F541xA and MSP430F543xA MCUs
    1.     Trademarks
    2. 1 Device Comparison
    3. 2 Hardware Considerations
      1. 2.1 PMM Settings and Low Power Consumption
      2. 2.2 Operating Frequency vs Supply Voltage
      3. 2.3 Internal Voltage Reference
      4. 2.4 Unified Clock System (UCS) Settings
      5. 2.5 Cyclic Redundancy Check Module
      6. 2.6 Device Errata
    4. 3 Firmware Considerations
      1. 3.1 PMM Default States
        1. 3.1.1 PMM Defaults for F543x
          1. 3.1.1.1 Power Management Module Control Register 0 (PMMCTL0)
          2. 3.1.1.2 Supply Voltage Supervisor and Monitor High-Side Control Register (SVSMHCTL)
          3. 3.1.1.3 Supply Voltage Supervisor and Monitor Low-Side Control Register (SVSMLCTL)
          4. 3.1.1.4 Power Management Module Reset and Interrupt Enable Register (PMMRIE)
        2. 3.1.2 PMM Defaults for F543xA
      2. 3.2 Internal Voltage Reference
        1. 3.2.1 ADC12 Temperature Sensor Equation
      3. 3.3 Bootloader (BSL)
    5. 4 References
  2.   Revision History

2.2 Operating Frequency vs Supply Voltage

Figure 1 and Figure 2 show the frequency vs supply voltage curves for theF543x and F543xA MCUs, respectively.[1][2]

g_freq_vcc_nona_laa419.gifFigure 1. Frequency vs Supply Voltage for F543x
g_freq_vcc_a_laa419.gifFigure 2. Frequency vs Supply Voltage for F543xA

The limitation that an F543x MCU must operate at no less than PMMCOREVx level 2 makes the operating range 2.2 V to 3.6 V. Because in-system programming (ISP) for the flash memory is valid over the entire operating range for the device, this also limits the range for flash ISP procedures. Furthermore, the F543x MCUs are specified to run up to 18 MHz.

The F543xA MCUs can operate from 1.8 V to 3.6 V with valid flash ISP across the entire operating range (see Figure 2). F543xA MCUs can run at up to 25 MHz. This flexibility provides both the performance to execute highly CPU-intensive tasks as well as the ability to optimize power consumption according to the speed requirements of the application.