CHAPTER 4: INSTRUCTION SET

 

 

LDB %EXT,imm8 Load immediate data imm8 into EXT reg.

1 cycle

Function: EXT ← imm8

 

Loads the 8-bit immediate data into the EXT register. The E flag is set to "1".

Code:

Mnemonic

 

MSB

 

 

 

 

 

 

 

LSB

 

LDB

%EXT,imm8

 

0

1

0

0

0

i7

i6

i5

i4

i3

i2

i1

i0

0800H–08FFH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flags:

E

 

I

C

 

Z

 

 

 

 

 

 

 

 

 

 

 

 

↑

 

–

–

 

–

 

 

 

 

 

 

 

 

 

 

 

 

Mode:

Src: Immediate data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dst: Register direct

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Extended addressing: Invalid

 

 

 

 

 

 

 

 

 

 

LDB %EXT,%BA

Load BA reg. into EXT reg.

 

 

 

 

 

 

1 cycle

Function: EXT ←

BA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Loads the content of the BA register into the EXT register. The E flag is set to "1".

Code:

Mnemonic

 

MSB

 

 

 

LSB

 

LDB %EXT,%BA

 

1

1

1

1

1

1

1

0

1

0

1

0

X

1FD4H, (1FD5H)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Flags:

E

I

C

 

Z

 

 

 

 

 

 

 

 

 

↑

–

–

 

–

 

 

 

 

 

 

 

 

 

 

 

 

 

Mode:

Src: Register direct

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dst: Register direct

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Extended addressing: Invalid

 

 

 

 

 

 

 

S1C63000 CORE CPU MANUAL

EPSON

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