Zilog Z16F2810 User Manual
Page 128
JP Instruction
UM018809-0611
112
ZNEO
®
CPU Core
User Manual
JP
Definition
Jump
Syntax
JP dst
Operation
PC
destination address
Description
The unconditional jump replaces the contents of the Program Counter with the destination
address. Program control then passes to the instruction addressed by the Program Counter.
In assembly language, the destination is typically specified as a label or 32-bit address operand.
When possible, the ZNEO CPU assembler automatically calculates a relative offset and generates
relative JP opcodes to produce more efficient object code. For a relative JP, the destination
address is the PC value plus two times the relative operand value.
In the JP (Rs) syntax, if the contents of Rs are odd the least significant bit is discarded, so that the
call destination address is always an even number.
To invoke a 32-bit addressed jump explicitly, use the JPA instruction.
Flags
Flags are not affected by this instruction.
Syntax and Opcodes
Example
Before:
PC=0000_0472H, R7=0000_3521H
JP (R7)
;Object Code: F207
After:
PC=0000_3520
Instruction, Operands
Word 0
Word 1
Word 2
JP (Rs)
{F20H, Rs}
JP rel12
{CH, rel12}
JP rel24
{F0H, rel[23:16]}
rel[15:0]