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ATmega16U4 датащи(PDF) 49 Page - ATMEL Corporation

номер детали ATmega16U4
подробное описание детали  8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller
PDF  408 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16U4 датащи(HTML) 49 Page - ATMEL Corporation

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49
7766D–AVR–01/09
ATmega16U4/ATmega32U4
Figure 8-1.
Reset Logic
Notes:
1. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)
8.0.3
Power-on Reset
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in Table 8-1. 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
Table 8-1.
Reset Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
VPOT
Power-on Reset Threshold Voltage (rising)
1.4
2.3
V
Power-on Reset Threshold Voltage (falling)
(1)
1.3
2.3
V
VPOR
VCC Start Voltage to ensure internal Power-on
Reset signal
-0.1
+0.1
V
VCCRR
VCC Rise Rate to ensure internal Power_on
Reset signal
0.3
V/ms
VRST
RESET Pin Threshold Voltage
0.2
Vcc
0.85
Vcc
V
tRST
Minimum pulse width on RESET Pin
5V, 25°C
400
ns
MCU Status
Register (MCUSR)
Brown-out
Reset Circuit
BODLEVEL [2..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
USB Reset
Detection



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