Zilog Z80380 Bedienungsanleitung PDF herunterladen (Seite 114)

5-80

Z380

™

USER'S MANUAL

DC-8297-03

ZILOG

JUMP

JP [cc,]dst dst = IR, DA

Operation: if (cc is TRUE) then begin

if (XM) then begin

PC(31-0) ← dst(31-0)

end

else begin

PC(15-0) ← dst(15-0)

end

A conditional jump transfers program control to the destination address if the setting of a

selected flag satisfies the condition code “cc” specified in the instruction; an unconditional

jump always transfers control to the destination address. If the jump is taken, the Program

Counter (PC) is loaded with the destination address; otherwise the instruction following the

Jump instruction is executed.

Each of the Zero, Carry, Sign, and Overflow flags can be individually tested and a jump

performed conditionally on the setting of the flag.

When using DA mode with the JP instruction, the operand is not enclosed in parentheses.

Flags: S: Unaffected

Z: Unaffected

H: Unaffected

V: Unaffected

N: Unaffected

C: Unaffected

Addressing Execute

Mode Syntax Instruction Format Time Note

IR: JP (HL) 11101001 2 X

JP (XY) 11y11101 11101001 2 X

DA: JP CC,addr 11-cc010 -a(low)- -a(high) 2 I, X

JP addr 11000011 -a(low)- -a(high) 2 I, X

Field Encodings: y: 0 for IX, 1 for IY

cc: 000 for NZ, 001 for Z, 010 for NC, 011 for C, 100 for PO/NV, 101 for PE/V, 110 for

P/NS,111 for M/S

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Zilog Z80380 Bedienungsanleitung Seite 114