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2.4
Register Configuration
The H8S/2000 CPU has the internal registers shown in figure 2.6. There are two types of registers:
general registers and control registers. Control registers are a 24-bit program counter (PC), an 8-bit
extended control register (EXR), and an 8-bit condition code register (CCR).
General Registers (Rn) and Extended Registers (En)
15
ER0
ER1
ER2
ER3
ER4
ER5
ER6
ER7 (SP)
Control Registers
[Legend]
SP:
Stack pointer
PC:
Program counter
EXR:
Extended control register
T:
Trace bit
I2 to I0:
Interrupt mask bits
CCR:
Condition-code register
I:
Interrupt mask bit
UI:
User bit or interrupt mask bit
Note: * Does not affect operation in this LSI.
E0
E1
E2
E3
E4
E5
E6
E7
23
H:
Half-carry flag
U:
User bit
N:
Negative flag
Z:
Zero flag
V:
Overflow flag
C:
Carry flag
Figure 2.6 CPU Internal Registers
0 7
0 7
R0H
R1H
R2H
R3H
R4H
R5H
R6H
R7H
PC
7 6 5 4 3 2 1 0
EXR*
T
7 6 5 4 3 2 1 0
CCR
I UI H U N Z V C
Rev. 1.00, 05/04, page 21 of 544
0
R0L
R1L
R2L
R3L
R4L
R5L
R6L
R7L
0
- - - -
I2 I1 I0
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