M38227ECFP Renesas Electronics America, M38227ECFP Datasheet - Page 44

• Manufacturer Part Number: M38227ECFP
• Description: IC 740 MCU EPROM 48K 80QFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M38227ECFP

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: LCD
• Number Of I /o: 49
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

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 V
5.5 V, and the quartz-crystal oscillator should be stable), reset is
released. After the reset is completed, the program starts from the
address contained in address FFFD
dress FFFC
voltage meets V
V
Fig. 40 Reset Sequence
CC
(min.).
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
IN
16
(low-order byte). Make sure that the reset input
IL
spec. when a power source voltage passes
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
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 .
I N :
16
a b o u t 8 0 0 0 c y c l e s
(high-order byte) and ad-
CC
(min.) and
I N
?
) a n d f ( ) i s f ( X
Fig. 39 Reset Circuit Example
?
I N
R E S E T
R E S E T
) = 8 • f ( )
?
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
?
V
V
CC
CC
MITSUBISHI MICROCOMPUTERS
Reset input
voltage
FFFC
P o w e r
s o u r c e
v o l t a g e
0 V
0 V
AD
L
FFFD
AD
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
3822 Group
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
P o w e r o n
H
A D
V
I L
H ,
s p e c .
A D
L
41