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eZ8

™

CPU Core

User Manual

UM012820-0810 SBC Instruction

218

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, the Carry flag is 1, and

Working Register R11 contains the value

20h, the following statement

leaves the value

F5h in Working Register R3, sets the C, S, and D flags

and clears the Z, V, and H flags:

SBC R3, R11



Object Code: 32 3B

If Working Register R15 contains the value 16h, the Carry flag is not set,

Working Register R10 contains the value

20h, and Register 20h contains

the value

11h, the following statement leaves the value 05h in Working

Mnemonic

Destination,

Source

Code

(Hex) Operand 1 Operand 2 Operand 3

SBC r1, r2 32 {r1, r2} — —

SBC r1, @r2 33 {r1, r2} — —

SBC R1, R2 34 R2 R1 —

SBCR1, @R235R2R1—

SBC R1, IM 36 R1 IM —

SBC @R1, IM 37 R1 IM —

1 2 ... 228 229 230 231 232 233 234 235 236 237 238 ... 313 314

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