Zilog Z8F0130 Manual de usuario descargar pdf (Pagina 96)

eZ8

™

CPU Core

User Manual

UM012820-0810 ADD Instruction

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 and Working Register R11

contains the value

20h, the following statement leaves the value 36h in

Working Register R3 and clears the C, Z, S, V, D, and H flags:

ADD R3, R11



Object Code: 02 3B

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

contains

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

statement leaves the value

27h in Working Register R15 and clears the C,

Z, S, V, D, and H flags:

ADD R15, @R10



Object Code: 03 FA

ADD R1, R2 04 R2 R1 —

ADDR1, @R205R2R1—

ADD R1, IM 06 R1 IM —

ADD @R1, IM 07 R1 IM —

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 313 314

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Zilog Z8F0130 Manual de usuario Pagina 96