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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.80 STB (Store Byte Data in Register to Memory)
Stores the byte data in "Ri" to memory address "(R13 + Rj)".
■ STB (Store Byte Data in Register to Memory)
Assembler format: STB Ri, @ (R13, Rj)
Operation: Ri → (R13 + Rj)
Flag change:
N, Z, V, and C: Unchanged
Execution cycles: a cycle(s)
Instruction format:
Example: STB R3, @(R13, R2)
NZVC
––––
MSB LSB
00010010 Rj Ri
R2
1234567B
0000 0004
0000 0021
R2
R3R3
0000 0021
21
0000 0004
1234567B
1234567C 1234567C
1234 5678
R13 R13
1234 5678
xx
Memory Memory
Before execution After execution
Instruction bit pattern : 0001 0010 0010 0011