m38039mf-xxxsp Mitsumi Electronics, Corp., m38039mf-xxxsp Datasheet - Page 90

• Manufacturer Part Number: m38039mf-xxxsp
• Description: Single-chip 8-bit Cmos Microcomputer
• Manufacturer: Mitsumi Electronics, Corp.

Fig. 85 State transitions of system clock
90
Notes
C M
C M
C M
C M
C M
C M
C M
C M
1 : S w i t c h t h e m o d e b y t h e a l l o w s s h o w n b e t w e e n t h e m o d e b l o c k s . ( D o n o t s w i t c h b e t w e e n t h e m o d e s d i r e c t l y w i t h o u t a n a l l o w . )
2 : T h e a l l m o d e s c a n b e s w i t c h e d t o t h e s t o p m o d e o r t h e w a i t m o d e a n d r e t u r n t o t h e s o u r c e m o d e w h e n t h e s t o p m o d e o r t h e w a i t m o d e i s
3 : T i m e r o p e r a t e s i n t h e w a i t m o d e .
4 : W h e n t h e s t o p m o d e i s e n d e d , a d e l a y o f a p p r o x i m a t e l y 1 m s o c c u r s b y c o n n e c t i n g p r e s c a l e r 1 2 a n d T i m e r 1 i n m i d d l e / h i g h - s p e e d m o d e .
5 : W h e n t h e s t o p m o d e i s e n d e d , a d e l a y o f a p p r o x i m a t e l y 0 . 2 5 s o c c u r s b y T i m e r 1 a n d T i m e r 2 i n l o w - s p e e d m o d e .
6 : W a i t u n t i l o s c i l l a t i o n s t a b i l i z e s a f t e r o s c i l l a t i n g t h e m a i n c l o c k X
7 : T h e e x a m p l e a s s u m e s t h a t 8 M H z i s b e i n g a p p l i e d t o t h e X
M i d d l e - s p e e d m o d e
7
6
5
4
7
6
5
4
M i d d l e - s p e e d m o d e
= 0
= 1
= 0 ( 8 M H z o s c i l l a t i n g )
= 1 ( 3 2 k H z o s c i l l a t i n g )
= 0
= 1
= 0 ( 8 M H z o s c i l l a t i n g )
= 0 ( 3 2 k H z s t o p p e d )
( f (φ) = 1 M H z )
e n d e d .
m o d e .
( f (φ) = 1 M H z )
R e s e t
C M
“ 1 ”← →“ 0 ”
CM
“1”←→“0”
6
6
C M
C M
C M
C M
CM
CM
CM
CM
C M
C M
C M
C M
CM
CM
CM
CM
7
6
5
4
7
6
5
4
7
6
5
4
7
6
5
4
High-speed mode
= 1
= 0
= 0 ( 8 M H z o s c i l l a t i n g )
= 1 ( 3 2 k H z o s c i l l a t i n g )
H i g h - s p e e d m o d e
=0
=0
=0(8 MHz oscillating)
=0(32 kHz stopped)
Low-speed mode
= 1
= 0
= 1 ( 8 M H z s t o p p e d )
= 1 ( 3 2 k H z o s c i l l a t i n g )
=0
=0
=0(8 MHz oscillating)
=1(32 kHz oscillating)
L o w - s p e e d m o d e
(f(φ)=4 MHz)
(f(φ)=16 kHz)
( f (φ) = 4 M H z )
( f (φ) = 1 6 k H z )
I N
p i n a n d 3 2 k H z t o t h e X
I N
b e f o r e t h e s w i t c h i n g f r o m t h e l o w - s p e e d m o d e t o m i d d l e / h i g h - s p e e d
b7
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
b4
C I N
C M
C M
C M
p i n . φ i n d i c a t e s t h e i n t e r n a l c l o c k .
4
5
7
MITSUBISHI MICROCOMPUTERS
, C M
: P o r t X c s w i t c h b i t
: M a i n c l o c k ( X
b 7 b 6
0 : I / O p o r t f u n c t i o n ( s t o p o s c i l l a t i n g )
1 : X
0 : O p e r a t i n g
1 : S t o p p e d
0
0
1
1
6
: 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
0 : φ = f ( X
1 : φ = f ( X
0 : φ = f ( X
1 : N o t a v a i l a b l e
C I N
C P U m o d e r e g i s t e r
( C P U M : a d d r e s s 0 0 3 B
- X
3803/3804 Group
C O U T
I N
o s c i l l a t i n g f u n c t i o n
I N
I N
C I N
- X
) / 2 ( H i g h - s p e e d m o d e )
) / 8 ( M i d d l e - s p e e d m o d e )
) / 2 ( L o w - s p e e d m o d e )
O U T
) s t o p b i t
1 6
)