M38517F8FP Renesas Electronics America, M38517F8FP Datasheet - Page 46

• Manufacturer Part Number: M38517F8FP
• Description: MCU 8-Bit 740 CISC 32KB Flash 5V 42-Pin SSOP
• Manufacturer: Renesas Electronics America

Specifications of M38517F8FP

• Package: 42SSOP
• Family Name: 740
• Maximum Speed: 8 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 34
• Interface Type: I2C-BUS
• On-chip Adc: 5-chx10-bit
• Operating Temperature: -20 to 85 °C
• Number Of Timers: 4

3851 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
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
Oct 15, 2003
O U T
(Built-in 24 KB or more ROM)
CC
of 2.7 V.
X
I N
page 44 of 89
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
A D
a r e i n t e r n a l s .
L
F F F D
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
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 .
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