Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 137)

eZ8

™

CPU Core

User Manual

UM012820-0810 CP Instruction

122

Escaped Mode Addressing

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

ing register. If the high nibble of the source or destination address is 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 R3 contains the value 16h and Working Register R11

contains the value

20h, the following statement sets the C and S flags,

and clears the Z and V flags:

CP R3, R11



Object Code: A2 3B

If Working Register R15 contains the value 16h, Working Register R10

contains the value

20h, and Register 20h contains 11h, the following

statement clears the C, Z, S, and V flags:

CP R15, @R10



Object Code: A3 FA

If Register 34h contains the value 2Eh and Register 12h contains the

value

1bh, the following statement clears the C, Z, S, and V flags:

CP R1, R2 A4 R2 R1 —

CP R1, @R2 A5 R2 R1 —

CP R1, IM A6 R1 IM —

CP @R1, IM A7 R1 IM —

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

1 2 ... 132 133 134 135 136 137 138 139 140 141 142 ... 313 314

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