AT90USB646 datasheet(60/434 Pages) ATMEL

부품명	AT90USB646

상세설명	Microcontroller with 64/128K Bytes of ISP Flash and USB Controller

PDF	434 Pages

Scroll/Zoom	100%

제조업체	ATMEL [ATMEL Corporation]

홈페이지	http://www.atmel.com

Logo

60 / 434 page

7593A–AVR–02/06

AT90USB64/128

Figure 8-2.

MCU Start-up, RESET Tied to V

Figure 8-3.

MCU Start-up, RESET Extended Externally

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.

Figure 8-4.

External Reset During Operation

8.0.5

Brown-out Detection

AT90USB64/128 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V

CC level

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

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

VCC

AT90USB646 데이터시트(PDF) 60 Page - ATMEL Corporation