M37544G Mitsubishi Electric, M37544G Datasheet - Page 31

• Manufacturer Part Number: M37544G
• Description: Single-Chip 8-Bit CMOS Microcomputer
• Manufacturer: Mitsubishi Electric

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. 36 Timing diagram at reset
Clock from built-in
ring oscillator RING
RESET
Address
RESET
Data
SYNC
OUT
8 MHz, the reset input voltage must be 0.9 V
16
as low-order address.
16
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 : A built-in ring oscillator applies about RING•2 MHz, •250 kHz frequency clock
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. 35 Example of reset circuit
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RESET
RESET
FFFC
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
AD
L
FFFD
AD
V
V
MITSUBISHI MICROCOMPUTERS
CC
AD
H
CC
H
,AD
Power source
voltage
Reset input
voltage
L
0 V
0 V
Note : Reset release voltage Vcc = 4.5 V
Reset address from the
vector table
7544 Group
Power source
voltage
detection circuit
Poweron
(Note)
0.2 V
CC
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