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Absolute Value of Accumulator
ABS
7-21
Assembly Language Instructions
Syntax ABS
Operands None
Opcode
0123456789101112131415
0000000001111101
Execution Increment PC, then ...
|(ACC)| → ACC; 0 → C
Status Bits
Affected by Affects
OVM C and OV
This instruction is not affected by SXM
Description If the contents of the accumulator are greater than or equal to zero, the accu-
mulator is unchanged by the execution of ABS. If the contents of the accumula-
tor are less than zero, the accumulator is replaced by its 2s-complement value.
The carry bit (C) on the ’C2xx is always reset to zero by the execution of this
instruction.
Note that 8000 0000h is a special case. When the overflow mode is not set
(OVM = 0), the ABS of 8000 0000h is 8000 0000h. When the overflow mode
is set (OVM = 1), the ABS of 8000 0000h is 7FFF FFFFh. In either case, the
OV status bit is set.
Words 1
Cycles for a Single ABS Instruction
ROM
DARAM SARAM External
1 1 1 1+p
Cycles for a Repeat (RPT) Execution of an ABS Instruction
ROM
DARAM SARAM External
n n n n+p
Cycles