JMP

JMP

JMP - Jump

Description

JMP changes the program counter so that the next "line" is not the next one in order. It is similar to GOTO in various BASIC dialects.

Flags affected
N	Z	C	I	D	V
-	-	-	-	-	-

Addressing Mode	Assembly	OpCode	No. Bytes.	No. Cycles
Absolute	JMP Oper	4c	3	3
Indirect	JMP (Oper)	6c	3	5

Examples

JMP works much like GOTO in many BASIC languages. If you think about the memory addresses as line numbers, it is easy to understand.

$0800 : INX
$0801 : JMP $0800

First, X is incremented by one by INX. Then, JMP is executed, sending the program counter back to $0800. This code will result in an endless loop that constantly increments X.

Related Pages

• JSR - Jump to Subroutine.
• program counter