M38867E8AHP MITSUBISHI [Mitsubishi Electric Semiconductor], M38867E8AHP Datasheet - Page 56

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

RESET CIRCUIT
To reset the microcomputer, RESET pin should be held at an "L"
level for 2 s or more. Then the RESET pin is returned to an "H"
level (the power source voltage should be between 2.7 V and 5.5
V (4.0 V to 5.5 V for flash memory version), and the oscillation
should be stable), reset is released. After the reset is completed,
the program starts from the address contained in address FFFD
(high-order byte) and address FFFC
that the reset input voltage is less than 0.54 V for V
flash memory version, make sure that the reset input voltage is
less than 0.8 V for Vcc of 4.0 V.
Fig. 56 Reset sequence
56
I n t e r n a l
r e s e t
R E S E T
A d d r e s s
D a t a
S Y N C
X
I N
X
I N
: 1 0 . 5 t o 1 8 . 5 c l o c k c y c l e s
16
?
(low-order byte). Make sure
?
?
N o t e s
CC
? ?
1 : T h e f r e q u e n c y r e l a t i o n o f f ( X
2 : T h e q u e s t i o n m a r k s ( ? ) i n d i c a t e a n u n d e f i n e d s t a t e t h a t d e p e n d s o n t h e p r e v i o u s s t a t e .
of 2.7 V. For
? ?
?
16
?
Fig. 55 Reset circuit example
?
F F F C
RESET
I N
RESET
) a n d f ( ) i s f ( X
A D
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
L
F F F D
A D
V
I N
V
CC
) = 8
MITSUBISHI MICROCOMPUTERS
CC
H
A D
•
Power source
voltage
Reset input
voltage
f ( ) .
H
0V
0V
Note : Reset release voltage ; Vcc=2.7 V
,
L
R e s e t a d d r e s s f r o m t h e v e c t o r t a b l e .
(Vcc = 4.0 V for flash memory version)
Power source
voltage detection
circuit
3886 Group
Poweron
(Note)
0.2V
CC