Ldub (Load Byte Data In Memory To Register) - Fujitsu FR Family Instruction Manual

CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.66

LDUB (Load Byte Data in Memory to Register)

Extend with zeros the byte data at memory address "Rj", load to "Ri".
■ LDUB (Load Byte Data in Memory to Register)
Assembler format: LDUB @Rj, Ri
Operation: extu ((Rj)) → Ri
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: b cycle(s)
Instruction format:
Example: LDUB @R2, R3
162
N Z V C
– – – –
MSB
0 0 0 0
R2
1 2 3 4 5 6 7 8
R3
x x x x x x x x
Memory
12345678 2 1
Before execution
0 1 1 0 Rj
LSB
Ri
R2
1 2 3 4 5 6 7 8
R3
0 0 0 0 0 0 2 1
Memory
12345678 2 1
After execution