General-Purpose Registers (R0 To R15); Control Registers - Renesas RX100 Series User Manual

RX13T Group
2.2.1

General-Purpose Registers (R0 to R15)

This CPU has 16 general-purpose registers (R0 to R15). R0 to R15 can be used as data registers or address registers.
R0, a general-purpose register, also functions as the stack pointer (SP). The stack pointer is switched to operate as the
interrupt stack pointer (ISP) or user stack pointer (USP) by the value of the stack pointer select bit (U) in the processor
status word (PSW).
2.2.2

Control Registers

This CPU has the following nine control registers.
 Interrupt stack pointer (ISP)
 User stack pointer (USP)
 Interrupt table register (INTB)
 Program counter (PC)
 Processor status word (PSW)
 Backup PC (BPC)
 Backup PSW (BPSW)
 Fast interrupt vector register (FINTV)
 Floating-point status word (FPSW)
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
2. CPU
Page 46 of 1041