Datasheet

Section 2 CPU
Rev. 3.00 Sep. 28, 2009 Page 21 of 710
REJ09B0384-0300
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).
TI2I1I0 EXR
76543210
PC
MACH
MACL
MAC
23
63 3241
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)
IUIHUNZVC
CCR
76543210
H:
U:
N:
Z:
V:
C:
MAC:
General Registers (Rn) and Extended Registers (En)
Control Registers (CR)
[Legend]
Sign extension
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Figure 2.6 CPU Registers