Zilog Z8F0130 Manual do Utilizador descarregar pdf (Página 242)

eZ8

™

CPU Core

User Manual

UM012820-0810 SRL Instruction

227

Attributes

Escaped Mode Addressing

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

ing register. If the destination address is prefixed by Eh (1110b), a work-

ing 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 B1h (10110001b), the follow-

ing statement leaves the value 58h (01011000b) in Working Register R6,

sets the Carry flag, and clears the Z, V, and S flags:

SRL R6



Object Code: 1F C0 E6

If Register C6h contains the value DFh, and Register DFh contains the

value

F8h (11111000b), the following statement leaves the value 7Ch

(

01111100b) in Register DFh and resets the C, Z, S, and V flags:

SRL @

C6h

Object Code: 1F C1 C6

Mnemonic Destination

Code

(Hex) Operand 1 Operand 2 Operand 3

SRL R1 1F C0 R1 — —

SRL @R1 1F C1 R1 — —

1 2 ... 237 238 239 240 241 242 243 244 245 246 247 ... 313 314

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Zilog Z8F0130 Manual do Utilizador Página 242