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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.64 LDUH (Load Half-word Data in Memory to Register)
Extends with zeros the half-word data at memory address "(R13 + Rj)", loads to "Ri".
■ LDUH (Load Half-word Data in Memory to Register)
Assembler format: LDUH @(R13, Rj), Ri
Operation: extu (( R13 + Rj)) → Ri
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: b cycle(s)
Instruction format:
Example: LDUH @(R13, R2), R3
NZVC
––––
MSB LSB
00000001 Rj Ri
R2
12345678
0000 0004
xxxx xxxx
R2
R3R3
4321
0000 4321
0000 0004
12345678
1234567C 1234567C
4321
1234 5678
R13 R13
1234 5678
Memory Memory
Before execution After execution
Instruction bit pattern : 0000 0001 0010 0011