Zilog Z8F0130 Manuel d'utilisateur télécharger pdf (Page 225)

eZ8

™

CPU Core

User Manual

UM012820-0810 RL Instruction

210

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 Register C6h contains the value 88h (10001000b), the following state-

ment leaves the value 11h (00010001b) in Register C6h., sets the C and

V flags and clears the S and Z flags:

C6h

Object Code: 90 C6

If the contents of Register C6h are 88h, and the contents of Register 88h

are

44h (01000100b), the following statement leaves the value 88h in

88h (10001000b), sets the S and V flags and clears the C and Z

flags:

RL @

C6h

Object Code: 91 C6

Mnemonic Destination

Op Code

(Hex) Operand 1 Operand 2 Operand 3

RL R1 90 R1 — —

RL @R1 91 R1 — —

1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 313 314

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Zilog Z8F0130 Manuel d'utilisateur Page 225