Registers; Figure 2.6 Cpu Registers - Hitachi H8S/2628 Hardware Manual

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).
General Registers (Rn) and Extended Registers (En)
15
ER0
ER1
ER2
ER3
ER4
ER5
ER6
ER7 (SP)
Control Registers (CR)
63
MAC
31
Legend
SP :Stack pointer
PC :Program counter
EXR :Extended control register
T :Trace bit
I2 to I0 :Interrupt mask bits
CCR :Condition-code register
I :Interrupt mask bit
UI :User bit or interrupt mask bit
0 7
E0
E1
E2
E3
E4
E5
E6
E7
23
Sign extension
MACL

Figure 2.6 CPU Registers

0 7
R0H R0L
R1H R1L
R2H R2L
R3H R3L
R4H R4L
R5H R5L
R6H R6L
R7H R7L
PC
7 6 5 4 3 2 1 0
- - - -
T
EXR
7 6 5 4 3 2 1 0
CCR
I UI H U N Z V C
41
MACH
H :Half-carry flag
U :User bit
N :Negative flag
Z :Zero flag
V :Overflow flag
C :Carry flag
MAC :Multiply-accumulate register
Rev. 1.0, 09/02, page 17 of 568
0
0
I2 I1 I0
32
0