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ATmega16 bảng dữ liệu(PDF) 39 Page - ATMEL Corporation

tên linh kiện ATmega16
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
PDF  357 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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ATmega16 bảng dữ liệu(HTML) 39 Page - ATMEL Corporation

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39
2466S–AVR–05/09
ATmega16(L)
Power-on Reset
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in Table 15. The POR is activated whenever V
CC is below the detection level. The
POR circuit can be used to trigger the Start-up Reset, as well as to detect a failure in supply
voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
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 16. MCU Start-up, RESET Tied to V
CC.
Figure 17. MCU Start-up, RESET Extended Externally
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
CC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC



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