Zilog Z80380 - Manual (Page 114)

5-80
Z380 ™
U SER ' S M ANUAL
DC-8297-03
Z ILOG
JP
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
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