1989_MELPS_7700_Software_Manual

BVS
Branch on Overflow Set
BVS
Operation
When V=1,
PC f- PC + 2 ± REL (REL is instruction's second byte)
PG f- PG + 1 (if carry on PC), PG. f- PG - 1 (if borrow on PC)
When V=O,
PC f- PC + 2
PG f- PG + 1 (if carry on PC)
Description
When the overflow flag V is set (1), the BVS instruction causes a branch to the
specified address. The branch address is specified by a relative address.
When the overflow flag V is clear (0), the program advances to next step without
any action.
Status flags
Not affected.
Addressing mode I Syntax Machine code Bytes Cycles
Relative I BVS rr 7016, rr 2 4
(Note1 )The cycles-count increases by 2 when a branch occurs.
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