Datasheet

Section 2 CPU
Rev. 3.00 Mar 17, 2006 page 29 of 926
REJ09B0283-0300
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. Control registers are a 24-bit program counter (PC), an 8-bit
extended 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 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
----
Note: * UI cannot be used as an interrupt mask bit in this LSI.
Figure 2.6 CPU Registers