Fujitsu CM71-00101-5E User Manual
169
CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
7.73
ST (Store Word Data in Register to Memory)
Subtracts 4 from the value of "R15", stores the word data in "Ri" to the memory address
indicated by the new value of "R15".
If "R15" is given as the parameter "Ri", the data transfer will use the value of "R15"
before subtraction.
indicated by the new value of "R15".
If "R15" is given as the parameter "Ri", the data transfer will use the value of "R15"
before subtraction.
■
ST (Store Word Data in Register to Memory)
Assembler format:
ST Ri, @ – R15
Operation:
R15 – 4
→
R15
Ri
→
(R15)
Flag change:
N, Z, V, and C: Unchanged
Execution cycles:
a cycle(s)
Instruction format:
Example:
ST R3, @ – R15
N
Z
V
C
–
–
–
–
MSB
LSB
0
0
0
1
0
1
1
1
0
0
0
0
Ri
12345674
R3
R3
8 7 6 5
4 3 2 1
8 7 6 5
4 3 2 1
12345674
12345678
12345678
1 2 3 4
5 6 7 8
8 7 6 5
4 3 2 1
R15
1 2 3 4
5 6 7 4
R15
x x x x
x x x x
Memory
Memory
Before execution
After execution
Instruction bit pattern : 0001 0111 0000 0011