88 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 01110[ FFH-imm8 ] 0E00H–0EFFH
CMP %Y,imm8 01111[ FFH-imm8 ] 0F00H–0FFFH
Flags: EICZ
↓ – ↕↕
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] 1000000a5a4a3a2a1a01000H–103FH
Flags: EICZ
↓ – ↕↕
Mode: 6-bit absolute addressing
Extended addressing: Invalid
