Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 58)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 Addressing Modes

Relative Addressing

Figure 15 displays the Relative Addressing mode, symbol RA. The

instruction specifies a two’s complement signed displacement in the range

of –128 to +127. This instruction, added to the contents of the Program

Counter, obtains the address of the next instruction to be executed. Prior

to the addition operation, the Program Counter contains the address of the

instruction immediately following the current relative addressing instruc-

tion. The JR and DJNZ instructions are the only instructions that use this

mode.

Figure 15. Relative Addressing

8-bit Value

Program Memory

–128 to +127

One Operand

Instruction

(Example)

Op Code

Displacement

Next Op Code

if Jump

16-bit Program

Memory address

is PC[15:0] + d[7:0]

if no Jump

PC[15:0]

If Jump taken,

PC[15:0] = PC[15:0] + d[7:0]

16-bit Program

Memory address

is PC[15:0]

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 313 314

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