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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
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
Operation: extu ((R13 + Rj)) → Ri
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: b cycle(s)
Instruction format:
Example: LDUB @(R13, R2), R3
NZVC
––––
MSB LSB
00000010 Rj Ri
R2
12345678
0000
0004
xxxx xxxx
R2
R3R3
21
0000 0021
0000 0004
12345678
1234567C 1234567C
21
1234 5678
R13 R13
1234 5678
Memory Memory
Before execution After execution
Instruction bit pattern : 0000 0010 0010 0011