Zilog Z8F0130 - Manual (Page 177)

eZ8
™
CPU Core
User Manual
UM012820-0810 JR cc Instruction
162
JR CC
Definition
Jump Relative Conditionally.
Syntax
JR cc, DA
Operation
If cc (condition code) is true (1){

PC
 PC + X
}
where the jump offset, X, is calculated by the eZ8 CPU assembler from
the Program Counter (PC) value and the Destination Address (DA).
Description
If the condition specified by the cc is true, the relative address offset is
added to the Program Counter and control passes to the instruction
located at the address specified by the Program Counter. For control code
information, see
Condition Codes on page 8. Otherwise, the instruction
following the JR instruction is executed. The range of the relative address
is +127 to –128 and the original value of the Program Counter is taken to
be the address of the first instruction byte following the JR instruction.
Flags
C Unaffected
Z Unaffected
S Unaffected
V Unaffected
D Unaffected
H Unaffected