SLAU367P October 2012 – April 2020 MSP430FR5041 , MSP430FR5043 , MSP430FR50431 , MSP430FR5847 , MSP430FR58471 , MSP430FR5848 , MSP430FR5849 , MSP430FR5857 , MSP430FR5858 , MSP430FR5859 , MSP430FR5867 , MSP430FR58671 , MSP430FR5868 , MSP430FR5869 , MSP430FR5870 , MSP430FR5872 , MSP430FR58721 , MSP430FR5887 , MSP430FR5888 , MSP430FR5889 , MSP430FR58891 , MSP430FR5922 , MSP430FR59221 , MSP430FR5947 , MSP430FR59471 , MSP430FR5948 , MSP430FR5949 , MSP430FR5957 , MSP430FR5958 , MSP430FR5959 , MSP430FR5962 , MSP430FR5964 , MSP430FR5967 , MSP430FR5968 , MSP430FR5969 , MSP430FR5969-SP , MSP430FR59691 , MSP430FR5970 , MSP430FR5972 , MSP430FR59721 , MSP430FR5986 , MSP430FR5987 , MSP430FR5988 , MSP430FR5989 , MSP430FR5989-EP , MSP430FR59891 , MSP430FR5992 , MSP430FR5994 , MSP430FR59941 , MSP430FR6005 , MSP430FR6007 , MSP430FR6035 , MSP430FR6037 , MSP430FR60371 , MSP430FR6041 , MSP430FR6043 , MSP430FR60431 , MSP430FR6045 , MSP430FR6047 , MSP430FR60471 , MSP430FR6820 , MSP430FR6822 , MSP430FR68221 , MSP430FR6870 , MSP430FR6872 , MSP430FR68721 , MSP430FR6877 , MSP430FR6879 , MSP430FR68791 , MSP430FR6887 , MSP430FR6888 , MSP430FR6889 , MSP430FR68891 , MSP430FR6920 , MSP430FR6922 , MSP430FR69221 , MSP430FR6927 , MSP430FR69271 , MSP430FR6928 , MSP430FR6970 , MSP430FR6972 , MSP430FR69721 , MSP430FR6977 , MSP430FR6979 , MSP430FR69791 , MSP430FR6987 , MSP430FR6988 , MSP430FR6989 , MSP430FR69891
The LEA begins executing the selected operation when the CPU writes a LEA command to the LEA command register when the LEA is in idle mode. Before writing the command, the CPU must configure the LEA argument registers with the pointers to the parameter blocks for the designated operation. The LEA performs the operation without CPU intervention and triggers an interrupt when the operation is complete.
The LEA accesses the LEA data memory, which is used for input data, output data, and the parameter blocks. The LEA data memory is also accessible by the CPU and the DMA, so that the output data of the LEA operation can be moved to other memory location by the CPU or the DMA (see Figure 17-1). The CPU and the LEA can run simultaneously and independently unless they access the same system memory (RAM). See the device-specific data sheet for details about LEA availability and LEA data memory size.
The LEA supports a various of commands that are used to perform vector-based mathematical operations. Table 17-1 lists the command groups that are available.
| Group | Purpose or Use |
|---|---|
| Group 1 | Basic pointwise vector and matrix operations |
| Group 2 | Basic vector MAC operations (windowing, scaling, general) |
| Group 3 | MAC, pointwise FIR, correlation, convolution |
| Group 4 | Basic minimum/maximum vector search operations on 16-bit data |
| Group 5 | Generic minimum/maximum search operations on 32-bit data |
| Group 6 | Generic minimum/maximum search operations on dual 16-bit data and complex |
| Group 7 | Block based FIR, correlation, convolution |
| Group 8 | Taylor functions and operations on pointwise vectors and matrices |
| Group 9 | FFT and iFFT bank filtering (DIT type) |
| Group 10 | Bit-reversed carry propagated presort for DIT-FFTs |
| Group 11 | FFT post operation for real points |
| Group 12 | Vector and matrix deinterleave and sort functions |
| Group A | Programming structure and rearrange functions |
| Group B | Special functions for math, matrix, and DSP |