Datasheet

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4.6.2.12 CLRN
* CLRN Clear negative bit
CLRN
Syntax
Operation 0 → N
or
(.NOT.src .AND. dst → dst)
BIC #4,SR
Emulation
Description The constant 04h is inverted (0FFFBh) and is logically ANDed with the destination
operand. The result is placed into the destination. The clear negative bit instruction is a
word instruction.
Status Bits N: Reset to 0
Z: Not affected
C: Not affected
V: Not affected
Mode Bits OSCOFF, CPUOFF, and GIE are not affected.
Example The negative bit in the SR is cleared. This avoids special treatment with negative
numbers of the subroutine called.
CLRN
CALL SUBR
...
...
SUBR JN SUBRET ; If input is negative: do nothing and return
...
...
...
SUBRET RET
175
SLAU144J–December 2004–Revised July 2013 CPUX
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