ATtiny261-ESSZ datasheet(42/227 Pages) ATMEL

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7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

Figure 9-3.

MCU Start-up, RESET Extended Externally

Table 9-1.

Power On Reset Specifications

Note:

1. Before rising, the supply has to be between

PORMIN and VPORMAX to ensure a Reset.

9.0.4

External Reset

An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer

than the minimum pulse width (see “System and Reset Characteristics” on page 190) will gener-

ate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a

reset. When the applied signal reaches the Reset Threshold Voltage – V

RST – on its positive

edge, the delay counter starts the MCU after the Time-out period – t

TOUT – has expired.

Figure 9-4.

External Reset During Operation

Symbol

Parameter

Min

Typ

Max

Unit

VPOT

Power-on Reset Threshold Voltage (rising)

1.1

1.4

1.7

Power-on Reset Threshold Voltage (falling)(1)

0.8

1.3

1.6

VPORMAX

VCC Max. start voltage to ensure internal

Power-on Reset signal

0.4

PORMIN

VCC Min. start voltage to ensure internal

Power-on Reset signal

-0.1

CCRR

VCC Rise Rate to ensure Power-on Reset

0.01

V/ms

VRST

RESET Pin Threshold Voltage

0.1 VCC

0.9VCC

RESET

TIME-OUT

INTERNAL

RESET

TOUT

RST

VCC

VPOT

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