AT90USB1286 datasheet(59/459 Pages) ATMEL

Part #	AT90USB1286

Description	8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller

PDF	459 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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59 / 459 page

7593H–AVR–11/08

ATmega32U6/AT90USB64/128

CC rise. The RESET signal is activated again, without any delay, when VCC decreases below

the detection level.

Figure 8-2.

MCU Start-up, RESET Tied to V

Figure 8-3.

MCU Start-up, RESET Extended Externally

Note:

If V

POR or VCCRR parameter range can not be followed, an External Reset is required.

8.0.4

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 8-1) 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.

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

POR

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

VCC

POR

AT90USB1286 Datasheet(PDF) 59 Page - ATMEL Corporation