Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 54)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 Addressing Modes

Indirect Register Addressing

In Indirect Register Addressing Mode, symbol IR, the contents of the

specified Register provide an address as displayed in Figure 11 and

Figure 12. Depending on the instruction selected, the specified Register

contents point to a register File, Program Memory, or an Data Memory

location. When accessing Program Memory or Data Memory, Register

Pairs or Working Register Pairs hold the 16-bit addresses.

Figure 11. Indirect Register Addressing to Register File

One 8-bit

Program Memory

Address

(dst)

One Operand

Instruction

(Example)

Op Code

dst[7:0]

Destination

12-bit address is

{RP[3:0], dst[7:0]}

Value used

in execution

contains 8-bit

address (addr[7:0])

12-bit address is

{RP[3:0], addr[7:0]}

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 313 314

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