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Ld [%ir]+,imm4, Ld [%ir],[%ir – Epson S1C63000 User Manual

Page 109

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S1C63000 CORE CPU MANUAL

EPSON

103

CHAPTER 4: INSTRUCTION SET

LD [%ir]+,imm4

Load immediate data imm4 into location [ir reg.] and increment ir reg. 1 cycle

Function:

[ir]

imm4, ir

ir + 1

Loads the 4-bit immediate data imm4 into the data memory addressed by the ir register (X or
Y). Then increments the ir register (X or Y).

Code:

Mnemonic

MSB

LSB

LD [%X]+,imm4

1

1

1

1

0

1

0

0

1 i3 i2 i1 i0

1E90H–1E9FH

LD [%Y]+,imm4

1

1

1

1

0

1

0

1

1 i3 i2 i1 i0

1EB0H–1EBFH

Flags:

E

I

C

Z

Mode:

Src: Immediate data
Dst: Register indirect
Extended addressing: Invalid

LD [%ir],[%ir’]

Load location [ir’ reg.] into location [ir reg.]

2 cycles

Function:

[ir]

[ir’]

Loads the content of the data memory addressed by the ir’ register (X or Y) into the data
memory addressed by the ir register (Y or X).

Code:

Mnemonic

MSB

LSB

LD [%X],[%Y]

1

1

1

1

0

1

1

1

1

1

0

1

0

1EFAH

LD [%Y],[%X]

1

1

1

1

0

1

1

1

1

1

0

0

0

1EF8H

Flags:

E

I

C

Z

Mode:

Src: Register indirect
Dst: Register indirect
Extended addressing: Invalid