1.4 Register Configuration
1.4.1 Overview
The H8/300H CPU has the internal registers shown in figure 1-7. There are two types of registers:
general and extended registers, and control registers.
Figure 1-7 CPU Registers
I U H U N Z V C
CCR
7 6 5 4 3 2 1 0
PC
23
0
15
07
07
0
SP
E0
E1
E2
E3
E4
E5
E6
E7
R0H
R1H
R2H
R3H
R4H
R5H
R6H
R7H
R0L
R1L
R2L
R3L
R4L
R5L
R6L
R7L
General registers (Rn) and extended registers (En)
Control registers (CR)
Legend
Stack pointer
Program counter
Condition code register
Interrupt mask bit
User bit or interrupt mask bit
Half-carry flag
Negative flag
Zero flag
Overflow flag
Carry flag
SP:
PC:
CCR:
I:
U:
H:
N:
Z:
V:
C:
8