HD6432670 Hitachi, HD6432670 Datasheet - Page 75

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

2.4
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).
Registers
Note: * UI cannot be used as an interrupt mask bit in this LSI.
General Registers (Rn) and Extended Registers (En)
Control Registers (CR)
Legend
ER0
ER1
ER2
ER3
ER4
ER5
ER6
ER7 (SP)
SP
PC
EXR
T
I2 to I0
CCR
I
UI
MAC
15
63
31
:Stack pointer
:Program counter
:Extended register
:Trace bit
:Interrupt mask bits
:Condition-code register
:Interrupt mask bit
:User bit or interrupt mask bit*
Figure 2.6 CPU Registers
E0
E1
E2
E3
E4
E5
E6
E7
23
Sign extension
MACL
0 7
H
U
N
Z
V
C
MAC
R0H
R1H
R2H
R3H
R4H
R5H
R6H
R7H
PC
:Half-carry flag
:User bit
:Negative flag
:Zero flag
:Overflow flag
:Carry flag
:Multiply-accumulate register
EXR
CCR
Rev. 2.0, 04/02, page 29 of 906
0 7
T
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
I UI H U N Z V C
41
- - - -
MACH
R0L
R1L
R2L
R3L
R4L
R5L
R6L
R7L
I2 I1 I0
32
0
0
0