ATtiny261-ESSZ datasheet(41/227 Pages) ATMEL

Il numero della parte	ATtiny261-ESSZ

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

PDF	227 Pages

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Produttore elettronici	ATMEL [ATMEL Corporation]

Homepage	http://www.atmel.com

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7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

Figure 9-1.

Reset Logic

9.0.3

Power-on Reset

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

is defined in “System and Reset Characteristics” on page 190. The POR is activated whenever

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.

Figure 9-2.

MCU Start-up, RESET Tied to V

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

RESET

TIME-OUT

INTERNAL

RESET

TOUT

RST

PORMAX

VCC

CCRR

PORMIN

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