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

3.2.3 I2C Mode

The major differences between the MSP430F261x USCI in I2C mode and the MSP430F16x USART are:

  • On the MSP430F16x, the I2C feature is exclusively available on USART0, while on the MSP430F261x, it is available on both USCI_B0 and USCI_B1 (two channels simultaneously).
  • On the MSP430F16x USART, all I2C activity (data exchange, status flag events) is routed through a single interrupt vector (USART0 TX vector). On the MSP430F261x USCI, both I2C capable USCI channels (USCI_B0 and USCI_B1) have two dedicated interrupt vectors each. One of the two vectors is used for data exchange, the other one for status events.
  • Arrangement of I2C status interrupt flags

Furthermore, the MSP430F261x USCI in I2C mode does not support the following features that were available with the MSP430F16x USART:

  • Automatic byte counting (I2CNDAT register)
  • Word-wide access to the I2C data register (I2CDRW register)
  • Decoding of the I2C interrupt source via an interrupt vector generator (I2CIV register)