Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 229)

eZ8

™

CPU Core

User Manual

UM012820-0810 RR Instruction

214

Attributes

Escaped Mode Addressing

Using Escaped Mode Addressing, address modes R or IR can specify a

working register. If the destination address is prefixed by

Eh (1110b), a

working register is inferred. For example, if Working Register R12 (

Ch) is

the preferred destination operand, use

ECh as the destination operand in

the Op Code. To access registers with addresses

E0h to EFh, either set the

Working Group Pointer,

RP[7:4], to Eh or use indirect addressing.

Sample Usage

If Working Register R6 contains the value 31h (00110001b), the follow-

ing statement leaves the value 98h (10011000b) in Working Register R6,

sets the C, V, and S flags, and clears the Z flag.

RR R6



Object Code: E0 E6

If Register C6h contains the value 31h and Register 31h contains the

value

7Eh (01111110b), the following statement leaves the value 3Fh

(

00111111b) in Register 31h and clears the C, Z, V, and S flags:

RR @C6h



Object Code: E1 C6

Mnemonic Destination

Code

(Hex) Operand 1 Operand 2 Operand 3

RR R1 E0 R1 — —

RR @R1 E1 R1 — —

1 2 ... 224 225 226 227 228 229 230 231 232 233 234 ... 313 314

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