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Sbc %r,imm4, Sbc %r,[%ir – Epson S1C63000 User Manual

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EPSON

S1C63000 CORE CPU MANUAL

CHAPTER 4: INSTRUCTION SET

SBC %r,imm4

Subtract with carry immediate data imm4 from r reg.

1 cycle

Function:

r

r - imm4 - C

Subtracts the 4-bit immediate data imm4 and carry (C) from the r register (A or B).

Code:

Mnemonic

MSB

LSB

SBC %A,imm4

1

1

0

0

0

1

1

0

0 i3 i2 i1 i0

18C0H–18CFH

SBC %B,imm4

1

1

0

0

0

1

1

0

1 i3 i2 i1 i0

18D0H–18DFH

Flags:

E

I

C

Z

Mode:

Src: Immediate data
Dst: Register direct
Extended addressing: Invalid

SBC %r,[%ir]

Subtract with carry location [ir reg.] from r reg.

1 cycle

Function:

r

r - [ir] - C

Subtracts the content of the data memory addressed by the ir register (X or Y) and carry (C)
from the r register (A or B).

Code:

Mnemonic

MSB

LSB

SBC %A,[%X]

1

1

0

0

0

1

1

1

0

0

0

0

0

18E0H

SBC %A,[%Y]

1

1

0

0

0

1

1

1

0

0

0

1

0

18E2H

SBC %B,[%X]

1

1

0

0

0

1

1

1

0

0

1

0

0

18E4H

SBC %B,[%Y]

1

1

0

0

0

1

1

1

0

0

1

1

0

18E6H

Flags:

E

I

C

Z

Mode:

Src: Register indirect
Dst: Register direct
Extended addressing: Valid

Extended

LDB

%EXT,imm8

operation:

SBC

%r,[%X]

r

r - [00imm8] - C (00imm8 = 0000H + 00H to FFH)

LDB

%EXT,imm8

SBC

%r,[%Y]

r

r - [FFimm8] - C (FFimm8 = FF00H + 00H to FFH)