SLAA380B December   2007  – September 2018 MSP430F2616 , MSP430F2617 , MSP430F2618 , MSP430F2619

 

  1.   Migrating From MSP430F16x MCUs to MSP430F261x MCUs
    1.     Trademarks
    2. 1 Comparison of MSP430F1xx and MSP430F2xx Families
    3. 2 Hardware Considerations for MSP430F16x to MSP430F261x Migration
      1. 2.1 Device Package and Pinout
      2. 2.2 Current Consumption
      3. 2.3 Operating Frequency and Supply Voltage
      4. 2.4 Device Errata
    4. 3 MSP430F16x to MSP430F261x Migration – Firmware Considerations
      1. 3.1 CPU and Memory Considerations
        1. 3.1.1 Extended Memory Architecture
        2. 3.1.2 Subroutine Parameter Passing and Stack Frame
        3. 3.1.3 MSP430X Instruction Cycle Count Optimizations
        4. 3.1.4 Device Memory Map
        5. 3.1.5 Information Flash Memory
      2. 3.2 Serial Communication – USART Versus USCI
        1. 3.2.1 UART Mode
        2. 3.2.2 SPI Mode
        3. 3.2.3 I2C Mode
      3. 3.3 Clock System
        1. 3.3.1 LFXT1 and XT2 Oscillators
        2. 3.3.2 Digitally Controlled Oscillator (DCO)
      4. 3.4 Bootloader
      5. 3.5 Interrupt Vectors
      6. 3.6 Beware of Reserved Bits!
      7. 3.7 Timers
      8. 3.8 Analog Comparator
    5. 4 References
  2.   Revision History

2.2 Current Consumption

When migrating to an MSP430F261x, the difference in current consumption of the devices should be considered. For example, in LFXT1 standby mode (LPM3 using a 32-kHz watch crystal), the standby current consumption of an MSP430F261x is in the 1.1-μA range (typical data sheet value at 3 V, 25°C), which is much lower than the current consumption of an MSP430F16x device, which is in the 2-μA to 2.6-μA range when performing the same function. This is a great benefit for applications that operate in standby mode most of the time. The active current consumption of the devices are comparable when operating at the same frequency, temperature, and voltage conditions. See the device-specific data sheets for the exact specifications. Note that when using LFXT1 in high-frequency mode or when using XT2, the current consumption component caused by the oscillator of an MSP430F261x device is slightly higher as compared to an MSP430F16x device due to differences in the oscillator design to support higher frequencies.

One additional point the designer should be aware of is that when taking advantage of the increased maximum operating frequency the MSP430F261x offers, additional current must be supplied by the system’s power supply, because active mode current consumption scales linearly with operating frequency.