HD64F2357F20V Datasheet, PDF (57/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

2.4 Register Configuration
2.4.1 Overview
The CPU has the internal registers shown in figure 2-4. There are two types of registers: general registers and control
registers.
General Registers (Rn) and Extended Registers (En)
15
ER0
E0
ER1
E1
ER2
E2
ER3
E3
ER4
E4
ER5
E5
ER6
E6
ER7 (SP)
E7
07
07
0
R0H
R0L
R1H
R1L
R2H
R2L
R3H
R3L
R4H
R4L
R5H
R5L
R6H
R6L
R7H
R7L
Control Registers (CR)
23
0
PC
76543210
EXR T — — — — I2 I1 I0
76543210
CCR I UI H U N Z V C
Legend:
SP:
PC:
EXR:
T:
Stack pointer
Program counter
Extended control register
Trace bit
H:
Half-carry flag
U:
User bit
N:
Negative flag
Z:
Zero flag
I2 to I0: Interrupt mask bits
CCR: Condition-code register
V:
Overflow flag
C:
Carry flag
I:
Interrupt mask bit
UI:
User bit or interrupt mask bit*
Note: * In the H8S/2357 Group, this bit cannot be used as an interrupt mask.
Figure 2-4 CPU Registers
2.4.2 General Registers
The CPU has eight 32-bit general registers. These general registers are all functionally alike and can be used as both
address registers and data registers. When a general register is used as a data register, it can be accessed as a 32-bit, 16-bit,
or 8-bit register. When the general registers are used as 32-bit registers or address registers, they are designated by the
letters ER (ER0 to ER7).
The ER registers divide into 16-bit general registers designated by the letters E (E0 to E7) and R (R0 to R7). These
registers are functionally equivalent, providing a maximum sixteen 16-bit registers. The E registers (E0 to E7) are also
referred to as extended registers.
Rev.6.00 Oct.28.2004 page 27 of 1016
REJ09B0138-0600H