We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS

BPL: Difference between revisions

From SnesLab
Jump to: navigation, search
(linkify admode)
(linkify flags)
Line 16: Line 16:
!colspan="9"|Flags Affected
!colspan="9"|Flags Affected
|+
|+
|N
|[[Negative Flag|N]]
|V
|[[Overflow Flag|V]]
|M
|[[M Flag|M]]
|X
|[[X Flag|X]]
|D
|[[Decimal Flag|D]]
|I
|[[I Flag|I]]
|Z
|[[Zero Flag|Z]]
|C
|[[Carry Flag|C]]
|+
|+
|.
|.

Revision as of 04:07, 27 November 2023

Basic Info
Addressing Mode Opcode Length Speed
Program Counter Relative 10 2 byte 2 cycles*
Flags Affected
N V M X D I Z C
. . . . . . . .

BPL (Branch if PLus) is a 65x instruction that performs a jump if the negative flag is clear. Note that zero is considered positive in the 65x architecture, so this instruction's behavior might be more accurately be described as "branch if non-negative."

The signed displacement of the target address can range from -128 to 127.

Cycle Penalties
  • BPL takes one additional cycle if the branch is taken
  • BPL takes another extra cycle if that branch taken crosses a page boundary in emulation mode.

See Also

External Links