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ATmega325P датащи(PDF) 46 Page - ATMEL Corporation

номер детали ATmega325P
подробное описание детали  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P датащи(HTML) 46 Page - ATMEL Corporation

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46
8023F–AVR–07/09
ATmega325P/3250P
Figure 10-1. Reset Logic
10.2.1
Power-on Reset
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in ”System and Reset Characterizations” on page 308. The POR is activated when-
ever 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 10-2. MCU Start-up, RESET Tied to V
CC
MCU Status
Register (MCUSR)
Brown-out
Reset Circuit
BODLEVEL [1..0]
Delay Counters
CKSEL[3:0]
CK
TIMEOUT
DATA BUS
Clock
Generator
SPIKE
FILTER
Pull-up Resistor
JTAG Reset
Register
Watchdog
Oscillator
SUT[1:0]
Power-on Reset
Circuit
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
CC



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