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2.4 Register Configuration
2.4.1 Overview
The H8/300H CPU has the internal registers shown in figure 2-3. There are two types of registers:
general registers and control registers.
General Registers (ERn)
15
ER0
E0
ER1
E1
ER2
E2
ER3
E3
ER4
E4
ER5
E5
ER6
E6
ER7
E7
Control Registers (CR)
PC
Legend
SP:
Stack pointer
PC:
Program counter
CCR:
Condition code register
I:
Interrupt mask bit
UI:
User bit or interrupt mask bit
H:
Half-carry flag
U:
User bit
N:
Negative flag
Z:
Zero flag
V:
Overflow flag
C:
Carry flag
0
7
R0H
R1H
R2H
R3H
R4H
R5H
R6H
(SP)
R7H
23
Figure 2-3 CPU Registers
19
0
7
0
R0L
R1L
R2L
R3L
R4L
R5L
R6L
R7L
0
7
6 5 4 3 2 1 0
CCR
I UI H U N Z V C
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