M38867E8AHP MITSUBISHI [Mitsubishi Electric Semiconductor], M38867E8AHP Datasheet - Page 59

• Manufacturer Part Number: M38867E8AHP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER??
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Fig. 60 System clock generating circuit block diagram (Single-chip mode)
N o t e : E i t h e r h i g h - s p e e d , m i d d l e - s p e e d o r l o w - s p e e d m o d e i s s e l e c t e d b y b i t s 7 a n d 6 o f t h e C P U m o d e r e g i s t e r .
I n t e r r u p t d i s a b l e f l a g l
W h e n l o w - s p e e d m o d e i s s e l e c t e d , s e t p o r t X c s w i t c h b i t ( b 4 ) t o “ 1 ” .
I n t e r r u p t r e q u e s t
X
C I N
X
I N
Q
S
R
R e s e t
X
“ 1 ”
C O U T
X
S T P i n s t r u c t i o n
O U T
P o r t X
s w i t c h b i t
“ 0 ”
M a i n c l o c k s t o p b i t
H i g h - s p e e d o r
m i d d l e - s p e e d
m o d e
M a i n c l o c k d i v i s i o n r a t i o
s e l e c t i o n b i t s ( N o t e )
C
L o w - s p e e d m o d e
W I T i n s t r u c t i o n
1 / 2
l o w - s p e e d m o d e
H i g h - s p e e d o r
1 / 4
R
S
1 / 2
Q
M a i n c l o c k d i v i s i o n r a t i o
s e l e c t i o n b i t s ( N o t e )
M i d d l e - s p e e d m o d e
Q
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
S
R
P r e s c a l e r 1 2
F F
S T P i n s t r u c t i o n
MITSUBISHI MICROCOMPUTERS
1 6
T i m i n g
( i n t e r n a l c l o c k )
T i m e r 1
0 1
3886 Group
1 6
R e s e t o r
S T P i n s t r u c t i o n
59