AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

Figure 9-3. MCU Start-up, RESET Extended Externally

VCC

VPOT

RESET

VRST

TIME-OUT

tTOUT

9.0.4

INTERNAL

RESET

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 – VRST – on its positive edge, the delay counter starts the MCU after

the Time-out period – tTOUT – has expired.

Figure 9-4. External Reset During Operation

CC

9.0.5

Brown-out Detection

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

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 VBOT+ =

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

Table 9-2. BODLEVEL Fuse Coding(1)(2)

BODLEVEL 2..0 Fuses

111

Min VBOT

Typ VBOT

Max VBOT

BOD Disabled

Units

110

4.5

V

101

2.7

V

100

4.3

V

011

4.4

V

48

4317K–AVR–03/2013

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