Rev. 1.0, 09/02, page 17 of 568
2.4 Registers
The H8S/2600 CPU has the internal registers shown in figure 2.6. There are two types of registers;
general registers and control registers. The control registers are a 24-bit program counter (PC), an
8-bit extended control register (EXR), an 8-bit condition code register (CCR), and a 64-bit
multiply-accumulate register (MAC).
T
I2 I1 I0
EXR
7 6 5 4 3 2 1 0
PC
MACH
MACL
MAC
23
63
32
41
31
0
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
EXR
T
I2 to I0
CCR
I
UI
:Stack pointer
:Program counter
:Extended control register
:Trace bit
:Interrupt mask bits
:Condition-code register
:Interrupt mask bit
:User bit or interrupt mask bit
:Half-carry flag
:User bit
:Negative flag
:Zero flag
:Overflow flag
:Carry flag
:Multiply-accumulate register
ER0
ER1
ER2
ER3
ER4
ER5
ER6
ER7 (SP)
I UI H U N Z V C
CCR
7 6 5 4 3 2 1 0
H
U
N
Z
V
C
MAC
General Registers (Rn) and Extended Registers (En)
Control Registers (CR)
Legend
Sign extension
- - - -
Figure 2.6 CPU Registers
Содержание H8S/2627
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