Datasheet

Section 2 CPU
Page 54 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
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