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Renesas PROM Programming Adapters PCA7438F-64A Spécifications Page 37

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Vue de la page 36
Rev.2.40 Jun 14, 2004 page 37 of 56
38C1 Group
Fig. 37 Example of reset circuit
RESET CIRCUIT
To reset the microcomputer, RESET pin should be held at an “L”
level for 2 µs or more. Then the RESET pin is returned to an “H”
level (the power source voltage should be between VCC(min.) and
5.5 V), reset is released. After the reset is completed, the program
starts from the address contained in address FFFD
16 (high-order
byte) and address FFFC
16 (low-order byte). Make sure that the re-
set input voltage is less than 0.2 VCC for VCC of VCC (min.).
Fig. 38 Reset Sequence
P
o
w
e
r
o
n
P
o
w
e
r
s
o
u
r
c
e
v
o
l
t
a
g
e
Reset input
voltage
Power source voltage
detection circuit
0.2 V
CC
0
V
0
V
V
C
C
R
E
S
E
T
V
C
C
R
E
S
E
T
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
=
3
.
0
V
(Note)
R
E
S
E
T
S
Y
N
C
φ
ROSC
F
F
F
C FFFD
AD
H, ADL
ADL
????
ADH
R
O
S
C
:
a
b
o
u
t
3
5
c
l
o
c
k
c
y
c
l
e
s
Notes 1 : f(ROSC) and
φ
are in the relationship : f(ROSC) = 8•f(
φ
)
2 : A question mark (?) indicates an undefined status that depends on the previous status.
R
e
s
e
t
a
d
d
r
e
s
s
f
r
o
m
v
e
c
t
o
r
t
a
b
l
e
Internal
reset
Address
D
a
t
a
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