Fujitsu CM71-00101-5E User Manual
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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
Example:
COPST #15, #4, CR2, R4
16-bit data is transferred through the bus to the coprocessor indicated by channel number 15. Next,
the output data of the coprocessor are transferred through the bus to that coprocessor.
Assuming that the coprocessor indicated by channel 15 is a single-precision
floating-decimal calculation unit, the coprocessor command "CC" set as shown in Table 7.118-1
will have the following effect on coprocessor operation.
Table 7.118-1 Conditions for Coprocessor Command "CC" (COPST)
CC
Calculation
00
Addition CRi + CRj
→ CRi
01
Subtraction CRi – CRj
→ CRi
02
Multiplication CRi × CRj
→ CRi
03
Division CRi ÷ CRj
→ CRi
Other
No calculation
MSB
LSB
0
0
0
0
0
1
0
0
0
0
1
0
0
1
0
0
R4
B F 8 0 0 0 0 0
R4
B F 8 0
B F 8 0
0 0 0 0
CR2
CR2
0 0 0 0
(CPU register)
(Coprocessor register)
(CPU register)
(Coprocessor register)
x x x x
x x x x
Before execution
After execution