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Cmp %ir,imm8 dec [addr6 – Epson S1C63000 User Manual

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EPSON

S1C63000 CORE CPU MANUAL

CHAPTER 4: INSTRUCTION SET

CMP %ir,imm8

DEC [addr6]

Compare ir reg. with immediate data imm8

1 cycle

Function:

ir - imm8
Subtracts the 8-bit immediate data imm8 from the content of the ir register (X or Y). It changes
the flags (Z and C), but does not change the register.

Code:

Mnemonic

MSB

LSB

CMP %X,imm8

0

1

1

1

0

[

FFH-imm8

]

0E00H–0EFFH

CMP %Y,imm8

0

1

1

1

1

[

FFH-imm8

]

0F00H–0FFFH

Flags:

E

I

C

Z

Mode:

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

Extended

LDB

%EXT,imm8

operation:

CMP %ir,imm8'

ir - imm16 (upper 8-bit: FFH - imm8, lower 8-bit: imm8')

Decrement location [addr6]

2 cycles

Function:

[addr6]

[addr6] - 1

(addr6 = 0000H–003FH)
Decrements (-1) the content of the data memory addressed by the addr6.

Code:

Mnemonic

MSB

LSB

DEC [addr6]

1

0

0

0

0

0

0 a5 a4 a3 a2 a1 a0 1000H–103FH

Flags:

E

I

C

Z

Mode:

6-bit absolute addressing
Extended addressing: Invalid