M37544G2AGP Renesas Electronics America, M37544G2AGP Datasheet - Page 35

• Manufacturer Part Number: M37544G2AGP
• Description: MCU 2/5V 8K 32-LQFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M37544G2AGP

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: WDT
• Number Of I /o: 25
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: QzROM
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Rev.1.04
REJ03B0012-0104Z
7544 Group
Reset Circuit
The microcomputer is put into a reset status by holding the RE-
SET pin at the “L” level for 2 s or more when the power source
voltage is 4.5 to 5.5 V and X
After that, this reset status is released by returning the RESET pin
to the “H” level. The program starts from the address having the
contents of address FFFD
tents of address FFFC
In the case of f( )
or less when the power source voltage passes 4.5 V.
Fig. 38 Timing diagram at reset
Clock from
on-chip oscillator
RING
RESET
2004.06.08
Address
RESET
SYNC
Data
OUT
8 MHz, the reset input voltage must be 0.9 V
16
as low-order address.
16
page 33 of 66
IN
as high-order address and the con-
is in stable oscillation. ______
8-13 clock cycles
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?
?
Notes
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1 : An on-chip oscillator applies about RING•2 MHz,
3 : These are all internal signals except RESET.
2 : The mark “?” means that the address is changeable depending on the previous state.
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at average of Vcc = 5 V.
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Fig. 37 Example of reset circuit
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RESET
RESET
?
FFFC
AD
L
FFFD
V
V
AD
CC
CC
AD
H
H
Power source
voltage
Reset input
voltage
,AD
0 V
0 V
L
Note : Reset release voltage Vcc 4.5V
Reset address from the
vector table
•250 kHz frequency clock
Power source
voltage
detection circuit
Poweron
(Note)
0.2 V
CC