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4551 Datasheet(PDF) 46 Page - Renesas Technology Corp

Part # 4551
Description  4-BIT SINGLE-CHIP MICROCOMPUTER
PDF  155 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4551 Datasheet(HTML) 46 Page - Renesas Technology Corp

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HARDWARE
1-34
4551 Group User’s Manual
VOLTAGE DROP DETECTION CIRCUIT
The built-in voltage drop detection circuit is designed to detect a
drop in voltage and to reset the microcomputer if the supply
voltage drops below a set value.
Fig. 32 Voltage drop detection reset circuit
Fig. 33 Voltage drop detection circuit operation waveform
FUNCTIONAL BLOCK OPERATIONS
RESET pin
WEF
Watchdog timer output
Internal reset signal
Power-on
reset circuit
Pull-up transistor
Voltage drop detection circuit
VDD
Reset voltage
Internal reset
signal
The microcomputer starts operation
after the f(XIN) is counted 10757 to
10786 times.



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