Register Set Of The Cpu - Renesas RX100 Series User Manual

RX13T Group
2.2

Register Set of the CPU

The RX CPU has 16 general-purpose registers, nine control registers, and one accumulator used for DSP instructions.
DSP instruction register
b63
Note 1. The stack pointer (SP) can be the interrupt stack pointer (ISP) or user stack pointer (USP), according to
the value of the U bit in the PSW register.
Figure 2.1 Register Set of the CPU
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
General-purpose registers
b31
R0 (SP)
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
Control registers
b31
ISP
USP
INTB
PC
PSW
BPC
BPSW
FINTV
FPSW
ACC (Accumulator)
*1
(Interrupt stack pointer)
(User stack pointer)
(Interrupt table register)
(Program counter)
(Processor status word)
(Backup PC)
(Backup PSW)
(Fast interrupt vector register)
(Floating-point status word)
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2. CPU
b0
b0
b0