FUJITSU MB91F109 FR30 - Manual (Page 81)

57
2.8 EIT (Exception, Interrupt, and Trap)
2.8.3 System Stack Pointer (SSP)
The system stack pointer (SSP) indicates the stack used to save data for EIT
processing or restore data for returning from EIT.
■ System Stack Pointer (SSP)
The configuration of the system stack pointer (SSP) register is shown below:
Value 8 is subtracted from the stack pointer during EIT processing, and 8 is added to it during
returning from EIT.
The initial value after resetting is 00000000H.
The SSP also functions as general-purpose register R15 when the S flag of the CCR is 0.
bit31 0
00000000
H
[Initial value]
SSP