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

7.67

LDUB (Load Byte Data in Memory to Register)

Extends with zeros the byte data at memory address "(R13 + Rj)", loads to "Ri".
■ LDUB (Load Byte Data in Memory to Register)
Assembler format: LDUB @ (R13, Rj), Ri
extu ((R13 + Rj)) → Ri
Operation:
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: b cycle(s)
Instruction format:
Example: LDUB @(R13, R2), R3
N Z V C
– – – –
MSB
0 0 0 0
Instruction bit pattern : 0000 0010 0010 0011
R2
0 0 0 0 0 0 0 4
R3
x x x x x x x x
1 2 3 4 5 6 7 8
R13
12345678
Memory
1234567C
2 1
Before execution
CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
0 0 1 0 Rj
LSB
Ri
R2
0 0 0 0 0 0 0 4
R3 0 0 0 0 0 0 2 1
1 2 3 4 5 6 7 8
R13
12345678
Memory
1234567C
2 1
After execution
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