![background image](http://html1.mh-extra.com/html/texas-instruments/tms320c28x/tms320c28x_reference-manual_1097071399.webp)
MPYXU P,T,loc16
6-242
MPYXU P,T,loc16
Multiply Signed Value by Unsigned Value
SYNTAX OPTIONS
OPCODE
OBJMODE
RPT
CYC
MPYXU P,T,loc16
0011 0010 LLLL LLLL
X
−
1
Operands
P
Product register
T
Multiplicand register
loc16
Addressing mode (see Chapter 5)
Description
Multiply the signed 16-bit content of the T register by the signed 16-bit
contents of the location pointed to by the “loc16” addressing mode and store
the 32-bit result in the P register:
P = signed T * unsigned [loc16];
Flags and
Modes
None
Repeat
This instruction is not repeatable. If this instruction follows the RPT
instruction, it resets the repeat counter (RPTC) and executes only once.
Example
; Calculate ”Y32 = X32 * M32” by parts using 16-bit multiply:
MOV T,@X32+0
; T = unsigned low X32
MPYU ACC,T,@M32+0
; ACC = T * unsigned low M32
MOV @Y32+0,AL
; Store low result into Y32
MOVU ACC,@AH
; Logical shift right ACC by 16
MOV T,@X32+1
; T = signed high X32
MPYXU P,T,@M32+0
; ACC = T * low unsigned M32
MOVA T,@M32+1
; T = signed high M32, ACC += P
MPYXU P,T,@X32+0
; ACC = T * low unsigned X32
ADDL ACC,@P
; Add P to ACC
MOV @Y32+1,AL
; Store high result into Y32
Summary of Contents for TMS320C28x
Page 30: ...1 12...
Page 80: ...This page intentionally left blank 2 50 This page intentionally left blank...
Page 269: ...IN loc16 PA 6 112 MOV AL 0 AL 0 UOUT IORegC AL IOspace IORegC AL 10...
Page 308: ...MAXCUL P loc32 6 151 Saturate MOVL Var64 2 ACC Store result into Var64 MOVL Var64 P...
Page 509: ...SUBL ACC P PM 6 352 SUBL ACC P PM ACC S B 11 M X 4 MOVH Y ACC 5 Store Q15 result into Y...
Page 585: ...This page intentionally left blank 7 32 This page intentionally left blank...