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eZ8

™

CPU Core

User Manual

UM012820-0810 CPC Instruction

125

Attributes

Escaped Mode Addressing

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

working register. If the high nibble of the source or destination address is

Eh (1110b), a working register is inferred. For example, if Working Reg-

ister R12 (Ch) is the preferred destination operand, use ECh as the destina-

tion 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, Working Register R11

contains the value

20h and the Carry flag is 1, the following statement

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

CPC R3, R11



Object Code: 1F A2 3B

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

contains the value

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

Carry flag is 0, the following statement clears the C, Z, S, and V flags:

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

CPC r1, r2 1F A2 {r1, r2} — —

CPC r1, @r2 1F A3 {r1, r2} — —

CPC R1, R2 1F A4 R2 R1 —

CPC R1, @R2 1F A5 R2 R1 —

CPC R1, IM 1F A6 R1 IM —

CPC @R1, IM 1F A7 R1 IM —

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