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ATmega16U4 bảng dữ liệu(PDF) 50 Page - ATMEL Corporation

tên linh kiện ATmega16U4
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller
PDF  408 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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ATmega16U4 bảng dữ liệu(HTML) 50 Page - ATMEL Corporation

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7766D–AVR–01/09
ATmega16U4/ATmega32U4
device is kept in RESET after V
CC rise. The RESET signal is activated again, without any delay,
when V
CC decreases below the detection level.
Figure 8-2.
MCU Start-up, RESET Tied to V
CC
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
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
CC
V
POR
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
V
POR
CC



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