Ssp (System Stack Pointer) - Fujitsu FR60 Hardware Manual

3.7.3

SSP (System Stack Pointer)

SSP (System Stack Pointer) is used to point to the stack to save and restore data when
EIT is accepted or a return operation occurs.
■ System Stack Pointer (SSP)
The configuration of the SSP register is shown below:
Eight is subtracted from the register value during EIT processing and eight is added to the register value
during the return operation from EIT that occurs when the RETI instruction is executed.
The system stack pointer (SSP) is initialized to 00000000
The SSP is also used as general-purpose register R15 if the S flag in the CCR is set to "0".
31...
SSP
...0 [Initial value]
00000000
H
by a reset.
H
77