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FR81 Family
92 FUJITSU MICROELECTRONICS LIMITED CM71-00105-1E
CHAPTER 6 INSTRUCTION OVERVIEW
6.2
● Dedicated register designated Field (Rs)
Among Instruction formats, field that designates dedicated register is 4-bit length Rs. Relation between bit
pattern of dedicated register and register designated field has been indicated in Table 6.2-2.
Table 6.2-2 Bit pattern of dedicated register and register designated field
Bit pattern which is shown as "Reserved" in the field that designates dedicated register is the reserved
pattern. Operation when reserved pattern is specified is not covered by the warranty.
● Floating point register designated field
Among instruction formats, fields that designate floating point register are 4-bit length FRi, FRj and FRk.
The relationship between the bit pattern of the floating point register and register designated field is
indicated in Table 6.2-3.
Table 6.2-3 Bit pattern of floating point register and register designated field
Rs Register Rs Register
0000
B
Table Base Register (TBR)
1000
B
Exception status register (ESR)
0001
B
Return Pointer (RP)
1001
B
Reserved
0010
B
System Stack Pointer (SSP)
1010
B
0011
B
User Stack Pointer (USP)
1011
B
0100
B
Multiply/Divide Register (MDH)
1100
B
0101
B
Multiply/Divide Register (MDL)
1101
B
0110
B
Base pointer (BP)
1110
B
0111
B
FPU control register (FCR)
1111
B
Debug register (DBR)
FRk/FRj/FRi Register FRk/FRj/FRi Register
0000
B
FR0
1000
B
FR8
0001
B
FR1
1001
B
FR9
0010
B
FR2
1010
B
FR10
0011
B
FR3
1011
B
FR11
0100
B
FR4
1100
B
FR12
0101
B
FR5
1101
B
FR13
0110
B
FR6
1110
B
FR14
0111
B
FR7
1111
B
FR15