ATMEGA3250 datasheet(41/353 Pages) ATMEL

tên linh kiện	ATMEGA3250

Giải thích chi tiết về linh kiện	8-bit Microcontroller with In-System Programmable Flash

PDF	353 Pages

Scroll/Zoom	100%

nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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41 / 353 page

ATmega325/3250/645/6450

2570J–AVR–11/06

Figure 16. MCU Start-up, RESET Tied to V

Figure 17. MCU Start-up, RESET Extended Externally

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 16) 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 18. External Reset During Operation

Brown-out Detection

ATmega325/3250/645/6450 has an On-chip Brown-out Detection (BOD) circuit for mon-

itoring the V

CC 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 hys-

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

RESET

TIME-OUT

INTERNAL

RESET

TOUT

POT

RST

VCC

ATMEGA3250 bảng dữ liệu(PDF) 41 Page - ATMEL Corporation