Hardware manual

Rev. 3.0, 09/98, page 16 of 361
2.2 Register Configuration
Figure 2.1 shows the register structure of the CPU. There are two groups of registers: the general
registers and control registers.
SP: Stack Pointer
PC: Program Counter
CCR: Condition Code Register
Carry flag
Overflow flag
Zero flag
Negative flag
Half-carry flag
Interrupt mask bit
User bit
User bit
07 07
R0H
R1H
R2H
R3H
R4H
R5H
R6H
R7H
R0L
R1L
R2L
R3L
R4L
R5L
R6L
R7L
015
PC
CCR
(SP)
7
I
6
U
5
H
4
U
3
N
2
Z
1
V
0
C
Figure 2.1 CPU Registers