DP8344 datasheet(142/184 Pages) NSC

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60 Reference Section (Continued)

JMP

Unconditional Relative Jump

Syntax

JMP

immediate

JMP

Affected Flags

None

Description

Unconditionally transfers control to the instruction at the

memory address calculated by adding the contents of the

Program Counter to either the immediate value n or the con-

tents of the source register Rs (both sign extended to 16

bits) Since the immediate value n and the contents of Rs

are 8-bit two’s complement displacements the uncondition-

al relative jump’s range is from a127 to b128 relative to

the Program Counter Note that the Program Counter initial-

ly contains the memory address of the next instruction fol-

lowing the jump

Example

Transfer control to the instruction labeled ‘‘Init

Xmit’’

which is within a127 b128 words relative to the PC

JMP

Init

Xmit

go initialize Transmitter

Instruction Format

JMP

11001011

Opcode

JMP

11001101100

Opcode

T-states

JMP

Bus Timing

JMP

Figure 6-2

JMP

Figure 6-4

Operation

JMP

PC a n(sign extended)

xPC

JMP

PC a Rs(sign extended)

xPC

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