Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 177)

100

101

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 + 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

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