AT90PWM2 datasheet(48/365 Pages) ATMEL

48 / 365 page

4317K–AVR–03/2013

AT90PWM2/3/2B/3B

Figure 9-3.

MCU Start-up, RESET Extended Externally

9.0.4

External Reset

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

minimum pulse width (see Table 9-1) will generate 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

9.0.5

Brown-out Detection

AT90PWM2/2B/3/3B has an On-chip Brown-out Detection (BOD) circuit for monitoring the V

level during operation by comparing it to a fixed trigger level. The trigger level for the BOD can

be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike free

Brown-out Detection. The hysteresis on the detection level should be interpreted as V

BOT+ =

BOT + VHYST/2 and VBOT- = VBOT - VHYST/2.

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

VCC

Table 9-2.

BODLEVEL Fuse Coding

(1)(2)

BODLEVEL 2..0 Fuses

Min VBOT

Typ VBOT

Max VBOT

Units

111

BOD Disabled

110

4.5

101

2.7

100

4.3

011

4.4

AT90PWM2 Datasheet(PDF) 48 Page - ATMEL Corporation

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