Texas Instruments MSP50C6xx - Manual (Page 129)

Instruction Classification
4-43 Assembly Language Instructions
Table 4–35. Class 9a Instruction Encoding
Bit 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Class 9a 1 1 1 0 1 0 0 An C9a 0 Rx 1 1
Class 9b 1 1 1 1 1 1 0 C9a imm8
Class 9c 1 1 1 1 1 0 1 APn 0 C9c x imm5
Class 9d 1 1 1 1 1 1 1 1 0 C9d 0 0 0 0
ENDLOOP n 1 1 1 1 1 1 1 1 0 0 0 0 1 0 0 0 n
NOP 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Table 4–36. Class 9a Instruction Description
C9a Mnemonic Description
0 0 FIRK An, *Rx Finite impulse response tap execution. When used with repeat counter will execute a
16 bit
×
16 bit multiplication between an indirect-addressed data memory buffer and
program memory (coefficients). 32-bit accumulation. Circular buffering. Each tap
executes in 2 cycles. Rx automatically increments by 2 per tap.
0 1 FIR An, *Rx Finite impulse response tap execution. When used with the repeat counter, it will
execute a 16 bit
×
16 bit multiplication between two indirect-addressed data memory
buffers into a 32-bit accumulator. Circular buffer operation. Executes in 2 instruction
cycles. Rx and R(x+1) automatically increments by 2 per tap.
1 0 CORK An, *Rx Correlation function. When used with repeat will execute 16
×
16 multiplication
between data memory and program memory, 48-bit accumulation, and a circular
buffer operation. Each tap takes 3 instruction cycles. Rx automatically increments by
2 per tap.
1 1 COR An, *Rx Correlation function. When used with repeat will execute 16
×
16 multiplication
between two indirectly addressed data memory buffers, 48-bit accumulation, and a
circular buffer operation. Each tap takes 3 instruction cycles. Rx and R(x+1)
automatically increments by 2 per tap.
Table 4–37. Class 9b Instruction Description
C9b Mnemonic Description
0 0 RPT imm8 Load the repeat counter with an 8-bit constant and execute the instruction
that follows imm8+2 times. Interrupts are queued during execution.
0 1 MOV STR, imm8 Load the STR register with an 8-bit constant.
1 0 MOV SV, imm4 Load the SV (shift value) register with a 4-bit constant.