m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 25

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

CENTRAL PROCESSING UNIT (CPU)
2.1 Central processing unit (CPU)
2.1 Central processing unit (CPU)
The CPU (Central Processing Unit) has 13 registers shown in Figure 2.1.1.
Fig. 2.1.1 CPU registers
2-2
b 1 5
b 3 1
B
H
b 1 5
0
b 8 b 7
0
b 7
b23
b7
0
DT
P G
B
L
0
b16
b 0
b 0
b0
0
E
b 1 5
b 1 5
b 1 5
b 1 5
b15
b 1 5
b 1 5
b 1 5
b15
b15
b 1 0
DPR0
D P R 1
D P R 2
D P R 3
PC
PS
A
X
Y
S
IPL
H
H
H
H
H
H
7905 Group User’s Manual Rev.1.0
H
H
H
H
b 8
b8 b7
b 8 b 7
b 8 b 7
b 8 b 7
b8 b7
b 8 b 7
b 8 b 7
b 8 b 7
b8 b7
b8 b7
b 7
N
DPR0
D P R 1
D P R 2
D P R 3
PC
P S
b 6
V
A
X
Y
S
L
L
L
L
L
L
b5
m
L
L
L
L
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b 4
x
A c c u m u l a t o r A ( A )
A c c u m u l a t o r B ( B )
A c c u m u l a t o r E ( E )
I n d e x r e g i s t e r X ( X )
I n d e x r e g i s t e r Y ( Y )
Stack pointer (S)
D a t a b a n k r e g i s t e r ( D T )
P r o g r a m c o u n t e r ( P C )
Program bank register (PG)
D i r e c t p a g e r e g i s t e r 0 ( D P R 0 )
Direct page register 1 (DPR1)
D i r e c t p a g e r e g i s t e r 2 ( D P R 2 )
Direct page register 3 (DPR3)
P r o c e s s o r s t a t u s r e g i s t e r ( P S )
b3
D
b2
I
b1
Z
b 0
C
C a r r y f l a g
Zero flag
I n t e r r u p t d i s a b l e f l a g
D e c i m a l m o d e f l a g
Index register length flag
D a t a l e n g t h f l a g
Overflow flag
N e g a t i v e f l a g
P r o c e s s o r i n t e r r u p t p r i o r i t y l e v e l