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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 110001001i3i2i1i01890H–189FH
SBC [%Y]+,imm4 110001011i3i2i1i018B0H–18BFH
Flags: EICZ
↓ – ↕↕
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 100001100n3n2n1n010C0H–10CFH
Flags: EICZ
↓ – ↕↕
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.