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CHAPTER 7 DETAILED EXECUTION INSTRUCTIONS
Example: COPSV #15, #4, CR2, R4
16-bit data is transferred through the bus to the coprocessor indicated by channel number 15. Next,
the data output by the coprocessor is loaded into the CPU through the data bus. Note that no
"coprocessor error" trap will be generated even if the coprocessor designated by the value "u4" has
generated an error in a previous operation.
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 7.119-1
will have the following effect on coprocessor operation.
Table 7.119-1 Conditions for Coprocessor Command "CC" (COPSV)
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
0000010000100100
R4
4000 0000
R4
4000
4000
0000
CR2 CR2
0000
(CPU register)
(Coprocessor register)
(CPU register)
(Coprocessor register)
xxxx xxxx
Before execution After execution