Epson S1C63000 SUB %r,%r’, SUB %r,imm4, Code:, Mode:, Code:, Mode:, Flags:, Flags:, 1 cycle, 1 cycle, Function:, Function: r ← r - r’, Subtract r’ reg. from r reg

		CHAPTER 4: INSTRUCTION SET
SUB %r,%r’	Subtract r’ reg. from r reg.	1 cycle
Function: r ← r - r’

Subtracts the content of the r’ register (A or B) from the r register (A or B).

Code:	Mnemonic			MSB														LSB
	SUB %A,%A				1		1	0	0	0	0	1	1	1	0	0	0		X	1870H, (1871H)
	SUB %A,%B				1		1	0	0	0	0	1	1	1	0	0	1		X	1872H, (1873H)
	SUB %B,%A				1		1	0	0	0	0	1	1	1	0	1	0		X	1874H, (1875H)
	SUB %B,%B				1		1	0	0	0	0	1	1	1	0	1	1		X	1876H, (1877H)
Flags:	E	I	C			Z
	↓	–	↕				↕	(r ≠	r’)
	↓	–	↓		↑			(r = r’)
Mode:	Src: Register direct
	Dst: Register direct
	Extended addressing: Invalid

SUB %r,imm4	Subtract immediate data imm4 from r reg.	1 cycle
Function: r ← r - imm4

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

Code:

Mnemonic

MSB

LSB

SUB %A,imm4

1

1

0

0

0

0

1

0

0

i3

i2

i1

i0

1840H–184FH

SUB %B,imm4

1

1

0

0

0

0

1

0

1

i3

i2

i1

i0

1850H–185FH

Flags:

E

I

C

Z

↓

–

↕

↕

Mode:

Src: Immediate data

Dst: Register direct

Extended addressing: Invalid

S1C63000 CORE CPU MANUAL EPSON 135