Z8
®
CPU
User Manual
UM001604-0108 Instruction Description
188
Jump
Syntax
JP cc, dst
Instruction Format
Operation
If cc (condition code) is true, then PC ← dst
A conditional jump transfers Program Control to the destination address if the condition
specified by cc (condition code) is true. Otherwise, the instruction following the JP
instruction is executed. See Condition Codes on page 146 for a list of condition codes.
The unconditional jump simply replaces the contents of the Program Counter with the
contents of the register pair specified by the destination operand. Program Control then
passes to the instruction addressed by the PC.
Address mode IRR can be used to specify a 4-bit Working Register. In this format, the desti-
nation Working Register operand is specified by adding
1110b (Eh) to the high nibble of
the operand. For example, if Working Register R12 (CH) is the destination operand, then
ECh is used as the destination operand in the Op Code.
Example 1
If the Carry Flag is set, the statement:
JP C, 1520h
Op Code: 7D 15 20
Cycles OPC (Hex)
Address Mode
dst
cc OPC dst
12 If jump taken ccD DA
10 If jump not taken cc = 0 to F
dst dst 8 30 IRR
Flag Description
C Unaffected
Z Unaffected
S Unaffected
V Unaffected
D Unaffected
H Unaffected
Edst
Note:
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