FUJITSU FR family 32-bit microcontroller instruction manuel CM71-00101-5E - Manual (Page 188)

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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.68 LDUB (Load Byte Data in Memory to Register)
Extends with zeros the byte data at memory address "(R14 + o8)", loads to "Ri".
The value "o8" is a signed calculation.
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LDUB (Load Byte Data in Memory to Register)
Assembler format: LDUB @ (R14, disp8), Ri
Operation: extu ((R14 + o8))
→
Ri
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: b cycle(s)
Instruction format:
Example: LDUB @(R14, 1), R3
N Z V C
– – – –
MSB LSB
0 1 1 0 Ri o8
12345678
x x x x x x x x R3 R3
2 1
0 0 0 0 0 0 2 1
12345678
12345679 12345679 2 1
1 2 3 4 5 6 7 8 R14 1 2 3 4 5 6 7 8 R14
Instruction bit pattern : 0110 0000 0001 0011
Memory Memory
Before execution After execution