FUJITSU FR family 32-bit microcontroller instruction manuel CM71-00101-5E - Manual (Page 50)

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CHAPTER 3 REGISTER DESCRIPTIONS
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Return Pointer Configuration
Figure 3.3-11 shows the bit configuration of the return pointer.
Figure 3.3-11 Return Pointer Bit Configuration
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Return Pointer Functions
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Return Pointer in Multiple "CALL" Instructions
Because the "RP" does not have a stack configuration, it is necessary to first execute a save when calling
one subroutine from another subroutine.
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Initial Value of Return Pointer
The initial value is undefined.
Bit no.
RP
31 00