Preliminary document
Specifications in this document are tentative and subject to change.
Under development
R8C/34W Group, R8C/34X Group, R8C/34Y Group, R8C/34Z Group
2. Central Processing Unit (CPU)
2. Central Processing Unit (CPU)
Figure 2.1 shows the CPU Registers. The CPU contains 13 registers. R0, R1, R2, R3, A0, A1, and FB configure a
register bank. There are two sets of register bank.
b31
b15
b8b7
b0
R0H (high-order of R0) R0L (low-order of R0)
R1H (high-order of R1) R1L (low-order of R1)
R2
R2
R3
Data registers (1)
R3
A0
Address registers (1)
A1
FB
Frame base register (1)
b19
b15
b0
b0
Interrupt table register
Program counter
INTBH
INTBL
The 4 high order bits of INTB are INTBH and
the 16 low order bits of INTB are INTBL.
b19
PC
b15
b0
User stack pointer
Interrupt stack pointer
Static base register
USP
ISP
SB
b15
b0
b0
Flag register
FLG
b15
b8
b7
IPL
U I O B S Z D C
Carry flag
Debug flag
Zero flag
Sign flag
Register bank select flag
Overflow flag
Interrupt enable flag
Stack pointer select flag
Reserved bit
Processor interrupt priority level
Reserved bit
Note:
1. These registers comprise a register bank. There are two register banks.
Figure 2.1
CPU Registers
REJ03B0312-0010 Rev.0.10
Apr 09, 2010
Page 20 of 67
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