Instruction Set Description
254
SLAU367P – October 2012 – Revised April 2020
Copyright © 2012–2020, Texas Instruments Incorporated
CPUX
4.6.3.37 XORX
XORX.A
Exclusive OR source address-word with destination address-word
XORX.[W]
Exclusive OR source word with destination word
XORX.B
Exclusive OR source byte with destination byte
Syntax
XORX.A src,dst
XORX src,dst
or
XORX.W src,dst
XORX.B src,dst
Operation
src .xor. dst
→
dst
Description
The source and destination operands are exclusively ORed. The result is placed into
the destination. The source operand is not affected. The previous contents of the
destination are lost. Both operands may be located in the full address space.
Status Bits
N:
Set if result is negative (MSB = 1), reset if positive (MSB = 0)
Z:
Set if result is zero, reset otherwise
C:
Set if result is not zero, reset otherwise (carry = .not. Zero)
V:
Set if both operands are negative (before execution), reset otherwise
Mode Bits
OSCOFF, CPUOFF, and GIE are not affected.
Example
Toggle bits in address-word CNTR (20-bit data) with information in address-word TONI
(20-bit address)
XORX.A
TONI,&CNTR
; Toggle bits in CNTR
Example
A table word pointed to by R5 (20-bit address) is used to toggle bits in R6.
XORX.W
@R5,R6
; Toggle bits in R6. R6.19:16 = 0
Example
Reset to zero those bits in the low byte of R7 that are different from the bits in byte EDE
(20-bit address)
XORX.B
EDE,R7
; Set different bits to 1 in R7
INV.B
R7
; Invert low byte of R7. R7.19:8 = 0.