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S1C63000 CORE CPU MANUAL EPSON 87
CHAPTER 4: INSTRUCTION SET
CMP [%ir],imm4
CMP [%ir]+,imm4
Compare location [ir reg.] with immediate data imm4 and increment ir reg. 1 cycle
Function: [ir] - imm4, ir ← ir + 1
Subtracts the 4-bit immediate data imm4 from the content of the data memory addressed by
the ir register (X or Y). It changes the flags (Z and C), but does not change the content of the
memory. Then increments the ir register (X or Y). The increment result of the ir register does
not affect the flags.
Code:
Mnemonic MSB LSB
CMP [%X]+,imm4 111100001i3i2i1i01E10H–1E1FH
CMP [%Y]+,imm4 111100011i3i2i1i01E30H–1E3FH
Flags: EICZ
↓ – ↕↕
Mode: Src: Immediate data
Dst: Register indirect
Extended addressing: Invalid
Compare location [ir reg.] with immediate data imm4 1 cycle
Function: [ir] - imm4
Subtracts the 4-bit immediate data imm4 from the content of the data memory addressed by
the ir register (X or Y). It changes the flags (Z and C), but does not change the content of the
memory.
Code:
Mnemonic MSB LSB
CMP [%X],imm4 111100000i3i2i1i01E00H–1E0FH
CMP [%Y],imm4 111100010i3i2i1i01E20H–1E2FH
Flags: EICZ
↓ – ↕↕
Mode: Src: Immediate data
Dst: Register indirect
Extended addressing: Valid
Extended LDB %EXT,imm8
operation: CMP [%X],imm4 [00imm8] - imm4 (00imm8 = 0000H + 00H to FFH)
LDB %EXT,imm8
CMP [%Y],imm4 [FFimm8] - imm4 (FFimm8 = FF00H + 00H to FFH)