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
0000BTable Base Register (TBR) 1000BException status register (ESR)
0001BReturn Pointer (RP) 1001B
Reserved
0010BSystem Stack Pointer (SSP) 1010B
0011BUser Stack Pointer (USP) 1011B
0100BMultiply/Divide Register (MDH) 1100B
0101BMultiply/Divide Register (MDL) 1101B
0110BBase pointer (BP) 1110B
0111BFPU control register (FCR) 1111BDebug register (DBR)
FRk/FRj/FRi Register FRk/FRj/FRi Register
0000BFR0 1000BFR8
0001BFR1 1001BFR9
0010BFR2 1010BFR10
0011BFR3 1011BFR11
0100BFR4 1100BFR12
0101BFR5 1101BFR13
0110BFR6 1110BFR14
0111BFR7 1111BFR15