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MB91354A

32-Bit Proprietary Microcontroller

Fujitsu 

MB91350A Series

• TBR (Table Base Register)

31

TBR

TBR

0 Initial Value:

0 0 0 FFC0 0 H

The table base register contains the start address of the vector table used for servicing EIT events.

The initial value after a reset is 000FFC00H

• RP (Return Pointer)

31

RP

RP

0 Initial Value:

XXXXXXXXH

The return pointer contains the address to which to return from a subroutine.

When the CALL instruction is executed, the value in the PC is transferred to the RP.

When the RET instruction is executed, the value in the RP is transferred to the PC.

The initial value after a reset is indeterminate.

• SSP (System Stack Pointer)

31

SSP

SSP

0 Initial Value:

00000000H

The SSP is the system stack pointer and functions as R15 when the S flag is “0”.

The SSP can be explicitly specified.

The SSP is also used as the stack pointer that specifies the stack for saving the PS and PC when an EIT event

occurs.

The initial value after a reset is 00000000H

• USP (User Stack Pointer)

31

USP

USP

0 Initial Value:

XXXXXXXXH

The USP is the user stack pointer and functions as R15 when the S flag is “1”.

The SSP can be explicitly specified.

The initial value after a reset is indeterminate.

This pointer cannot be used by the RETI instruction.

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