ATtiny45 datasheet(36/196 Pages) ATMEL

Teilenummer	ATtiny45

Bauteilbeschribung	8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash

PDF	196 Pages

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Hersteller	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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36 / 196 page

7598H–AVR–07/09

ATtiny25/45/85

Figure 8-1.

Reset Logic

8.3

Power-on Reset

A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level

is defined in Table 8-1. The POR is activated whenever V

CC is below the detection level. The

POR circuit can be used to trigger the Start-up Reset, as well as to detect a failure in supply

voltage.

A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the

Power-on Reset threshold voltage invokes the delay counter, which determines how long the

device is kept in RESET after V

CC rise. The RESET signal is activated again, without any delay,

when V

CC decreases below the detection level.

MCU Status

Brown-out

Reset Circuit

BODLEVEL [1..0]

Delay Counters

CKSEL[1:0]

TIMEOUT

DATA BUS

Clock

Generator

SPIKE

FILTER

Pull-up Resistor

Watchdog

Oscillator

SUT[1:0]

Power-on Reset

Circuit

ATtiny45 Datenblatt(PDF) 36 Page - ATMEL Corporation