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Sbc [%ir]+,imm4, Sbc %b,%a,n4 – Epson S1C63000 User Manual

Page 133

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S1C63000 CORE CPU MANUAL

EPSON

127

CHAPTER 4: INSTRUCTION SET

SBC [%ir]+,imm4

Subtract with carry immediate data imm4 from location [ir reg.] and increment ir reg. 2 cycles

Function:

[ir]

[ir] - imm4 - C, ir

ir + 1

Subtracts the immediate data imm4 and carry (C) from the data memory addressed by the ir
register (X or Y). Then increments the ir register (X or Y). The flags change due to the operation
result of the data memory and the increment result of the ir register does not affect the flags.

Code:

Mnemonic

MSB

LSB

SBC [%X]+,imm4

1

1

0

0

0

1

0

0

1 i3 i2 i1 i0

1890H–189FH

SBC [%Y]+,imm4

1

1

0

0

0

1

0

1

1 i3 i2 i1 i0

18B0H–18BFH

Flags:

E

I

C

Z

Mode:

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

SBC %B,%A,n4

Subtract with carry A reg. from B reg. in specified radix

2 cycles

Function:

B

N’s adjust (B - A - C)

Subtracts the content of the A register and carry (C) from the B register. The operation result is
adjusted with n4 as the radix. The C flag is set according to the radix.

Code:

Mnemonic

MSB

LSB

SBC %B,%A,n4

1

0

0

0

0

1

1

0

0 n3 n2 n1 n0 10C0H–10CFH

Flags:

E

I

C

Z

Mode:

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

Note:

n4 should be specified with a value from 1 to 16. When 16 is specified for n4, the low-order 4
bits of the machine code (n3–n0) become 0000B.