Texas Instruments MSP50C614 Cork Correlation Filter Function, An, *Rx 3nR+2, Rxeven = Rxeven + R5

Individual Instruction Descriptions

4.14.14 CORK				Correlation Filter Function
Syntax
	[label]	name		dest, src	Clock, clk	Word, w	With RPT, clk	Class
		CORK		An, *Rx	3	1	3(nR+2)	9a
Execution			With RPT N±2:
			(mask interrupts)
			RPT counter = N±2
			MR = h[0] = first filter coefficient
			x = sample data pointed at by Rxeven
			h[1] = second filter coefficient pointed by DP
			y = result stored in three consecutive accumulators (48 bit) pointed by An
			{between every accumulation}
			IF TAG = 1
				Rxeven = Rxeven + R5	{for circular buffering}
			ELSE
				Rxeven++	{ if Rx++ is specified in the instruction}
			ENDIF PC ⇐ PC + 1

{final result}

y+ ￿k+0..N±1 h [k] ´ x[N±1±k]

(Execution is detailed in section 4.11)

Flags Affected	None
Opcode
Instructions		16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
CORK An, *Rx		1	1	1	0	1	0	0	An		1	0	0		Rx		1	1
Description	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. Selected register Rx must be
	even. This instruction also uses R(x+1). This instruction must be used with
	RPT instruction. See section 4.11 for more detail on the setup of coefficents
	and sample data. During CORK execution, interrupt is queued.
See Also	RPT, COR, FIR, FIRK
Example 4.14.13.1	RPT 0

CORK A0, *R0

Computes the calculation for 2 tap correlation filter with 48 bit accumulation. See section 4.11 for more detail on the setup of coefficents and sample data.

Assembly Language Instructions 4-95