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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
ER1
ER2
ER3
ER4
ER5
ER6
ER7
Control Registers (CR)
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
E0
E1
E2
E3
E4
E5
E6
E7
23
PC
Figure 2-3 CPU Registers
0
7
R0H
R1H
R2H
R3H
R4H
R5H
R6H
(SP)
R7H
CCR
0
7
R0L
R1L
R2L
R3L
R4L
R5L
R6L
R7L
7
6 5 4 3 2 1 0
I UI H U N Z V C
0
0
19
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