Interrupt Stack Pointer (Isp)/User Stack Pointer (Usp); Interrupt Table Register (Intb); Program Counter (Pc) - Renesas RX100 Series User Manual

RX13T Group
2.2.2.1

Interrupt Stack Pointer (ISP)/User Stack Pointer (USP)

b31
ISP
Value after reset: 0 0 0 0
b31
USP
Value after reset: 0 0 0 0
The stack pointer (SP) can be either of two types, the interrupt stack pointer (ISP) or the user stack pointer (USP).
Whether the stack pointer operates as the ISP or USP depends on the value of the stack pointer select bit (U) in the
processor status word (PSW).
Set the ISP or USP to a multiple of 4, as this reduces the numbers of cycles required to execute interrupt sequences and
instructions entailing stack manipulation.
2.2.2.2

Interrupt Table Register (INTB)

b31
Undefined
Value after reset:
The interrupt table register (INTB) specifies the address where the relocatable vector table starts.
2.2.2.3

Program Counter (PC)

b31
Value after reset: Contents of addresses FFFFFFFCh to FFFFFFFFh
The program counter (PC) indicates the address of the instruction being executed.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
Page 47 of 1041
2. CPU
b0
0 0 0 0
b0
0 0 0 0
b0
b0