Ldb %sp,%ba – Epson S1C63000 User Manual
Page 117
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S1C63000 CORE CPU MANUAL
EPSON
111
CHAPTER 4: INSTRUCTION SET
LDB %sp,%BA
Load BA reg. into stack pointer
1 cycle
Function:
sp
←
BA
Loads the content of the BA register into the stack pointer sp (SP1 or SP2).
Code:
Mnemonic
MSB
LSB
LDB %SP1,%BA
1
1
1
1
1
1
1
0
0
0
1
0
X
1FC4H, (1FC5H)
LDB %SP2,%BA
1
1
1
1
1
1
1
0
0
0
1
1
X
1FC6H, (1FC7H)
Flags:
E
I
C
Z
↓
–
–
–
Mode:
Src: Register direct
Dst: Register direct
Extended addressing: Invalid
NOP
No operation
1 cycle
Function:
No operation (PC
←
PC+1)
Expends 1 cycle without doing an operation that otherwise exerts an affect. The PC (program
counter) is incremented.
Code:
Mnemonic
MSB
LSB
NOP
1
1
1
1
1
1
1
1
1
1
1
1
X
1FFEH, (1FFFH)
Flags:
E
I
C
Z
↓
–
–
–
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