m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 25
m37905
Manufacturer Part Number
m37905
Description
Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M37905.pdf
(565 pages)
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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
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