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FR81 Family
CM71-00105-1E FUJITSU MICROELECTRONICS LIMITED 19
CHAPTER 3 PROGRAMMING MODEL
3.3
3.3 Dedicated Registers
FR81 Family CPU has dedicated registers reserved for special usages.
3.3.1 Configuration of Dedicated Registers
Dedicated registers are used for special purposes. The following dedicated registers are available.
• Program counter (PC)
• Program status (PS)
• Return pointer (RP)
• System stack pointer (SSP)
• User stack pointer (USP)
• Table base register (TBR)
• Multiplication/Division Register (MDH, MDL)
• Base Pointer (BP)
• FPU control register (FCR)
• Exception status register (ESR)
• Debug register (DBR)
Figure 3.3-1 shows the configuration and initial values of dedicated registers.
Figure 3.3-1 Configuration and Initial Values of Dedicated Registers
PC
PS
-
ILM
-
SCR CCR
TBR
RP
SSP
USP
MDH
MDL
32 bits
Program counter
Program status
Table base register
Return pointer
System stack pointer
User stack pointer
BP
FCR
ESR
DBR
Base Pointer
FPU control register
Except status register
Debug register
Multiplication/Division
registers
[Initial value]