SLAZ220P October   2012  – May 2021 MSP430F46171

 

  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.      ZQW113
      2.      PZ100
    3. 5.3 Memory-Mapped Hardware Revision (TLV Structure)
  6. 6Advisory Descriptions
    1. 6.1  CPU8
    2. 6.2  CPU16
    3. 6.3  CPU19
    4. 6.4  DMA3
    5. 6.5  DMA4
    6. 6.6  FLL3
    7. 6.7  FLL6
    8. 6.8  LCDA5
    9. 6.9  LCDA7
    10. 6.10 RTC1
    11. 6.11 TA12
    12. 6.12 TA16
    13. 6.13 TA18
    14. 6.14 TA21
    15. 6.15 TAB22
    16. 6.16 TB2
    17. 6.17 TB16
    18. 6.18 TB18
    19. 6.19 TB24
    20. 6.20 USCI16
    21. 6.21 USCI19
    22. 6.22 USCI20
    23. 6.23 USCI21
    24. 6.24 USCI22
    25. 6.25 USCI23
    26. 6.26 USCI24
    27. 6.27 USCI25
    28. 6.28 USCI26
    29. 6.29 USCI27
    30. 6.30 USCI30
    31. 6.31 USCI34
    32. 6.32 USCI35
    33. 6.33 USCI40
    34. 6.34 WDG2
    35. 6.35 XOSC5
    36. 6.36 XOSC8
    37. 6.37 XOSC9
  7. 7Revision History

USCI34

USCI Module

Category

Functional

Function

I2C multi-master transmit may lose first few bytes.

Description

In an I2C multi-master system (UCMM =1), under the following conditions:

(1)the master is configured as a transmitter (UCTR =1)

AND

(2)the start bit is set (UCTXSTT =1);

if the I2C bus is unavailable, then the USCI module enters an idle state where it waits and checks for bus release. While in the idle state it is possible that the USCI master updates its TXIFG based on clock line activity due to other master/slave communication on the bus. The data byte(s) loaded in TXBUF while in idle state are lost and transmit pointers initialized by the user in the transmit ISR are updated incorrectly.

Workaround

Verify that the START condition has been sent (UCTXSTT =0) before loading TXBUF with data.

Example:
#pragma vector = USCIAB0TX_VECTOR
__interrupt void USCIAB0TX_ISR(void)
{
// Workaround for USCI34
    if(UCB0CTL1&UCTXSTT)
    {
                                                                       // TXData = pointer to the transmit buffer start
                                                                       // PTxData = pointer to transmit in the ISR
        PTxData = TXData;                                   // restore the transmit buffer pointer if the Start bit is set
    }
//
    if(IFG2&UCB0TXIFG)
    {
        if (PTxData < = PTxDataEnd)                      // Check TX byte counter
        {
            UCB0TXBUF = *PTxData++;                 // Load TX buffer
        }
        else
        {
            UCB0CTL1 |= UCTXSTP;                        // I2C stop condition
            IFG2 &= ~UCB0TXIFG;                          // Clear USCI_B0 TX int flag
            __bic_SR_register_on_exit(CPUOFF);      // Exit LPM0
        }
    }
}