m37516e6hp Renesas Electronics Corporation., m37516e6hp Datasheet - Page 46

• Manufacturer Part Number: m37516e6hp
• Description: Single-chip 8-bit Cmos Microcomputer
• Manufacturer: Renesas Electronics Corporation.

7516 Group
RESET CIRCUIT
To reset the microcomputer, RESET pin must be held at an “L”
level for 20 cycles or more of X
to an “H” level (the power source voltage must be between 2.7 V
and 5.5 V, and the oscillation must be stable), reset is released.
After the reset is completed, the program starts from the address
contained in address FFFD
FFFC
less than 0.54 V for V
Fig. 50 Reset sequence
Rev.1.01
16
(low-order byte). Make sure that the reset input voltage is
RESET
R E S E T
Address
D a t a
S Y N C
X
I N
Jul 01, 2003
O U T
CC
of 2.7 V.
X
page 44 of 89
I N
16
: 8 t o 1 3 c l o c k c y c l e s
IN
. Then the RESET pin is returned
(high-order byte) and address
?
?
?
N o t e s
? ?
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 .
3 : A l l s i g n a l s e x c e p t X
? ?
?
?
Fig. 49 Reset circuit example
I N
?
a n d
R E S E T
FFFC
R E S E T
R E S E T
I N
) a n d f ( ) i s f ( X
AD
a r e i n t e r n a l s .
L
FFFD
V
V
C C
C C
AD
I N
) = 8
P o w e r s o u r c e
v o l t a g e
Reset input
voltage
H
A D
•
0V
0V
N o t e : R e s e t r e l e a s e v o l t a g e ; V c c = 2 . 7 V
f ( ) .
H
,
L
Reset address from the vector table.
P o w e r s o u r c e
v o l t a g e d e t e c t i o n
c i r c u i t
P o w e r o n
( N o t e )
0 . 2 V
C C