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Rev. 1.0, 07/01, page 10 of 372
2.2 Register Configuration
The H8/300H CPU has the internal registers shown in figure 2-2. There are two types of registers;
general registers and control registers. The control registers are a 24-bit program counter (PC), and
an 8-bit condition code register (CCR).
PC
23 0
15 0 7 0 7 0
E0
E1
E2
E3
E4
E5
E6
E7
R0H
R1H
R2H
R3H
R4H
R5H
R6H
R7H
R0L
R1L
R2L
R3L
R4L
R5L
R6L
R7L
SP
PC
CCR
I
UI
:Stack pointer
:Program counter
:Condition-code register
:Interrupt mask bit
:User bit
:Half-carry flag
:User bit
:Negative flag
:Zero flag
:Overflow flag
:Carry flag
ER0
ER1
ER2
ER3
ER4
ER5
ER6
ER7
IUIHUNZVC
CCR
76543210
H
U
N
Z
V
C
General Registers (ERn)
Control Registers (CR)
Legend
(SP)
Figure 2-2 CPU Registers