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ATtiny25 датащи(PDF) 37 Page - ATMEL Corporation

номер детали ATtiny25
подробное описание детали  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  196 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny25 датащи(HTML) 37 Page - ATMEL Corporation

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37
7598H–AVR–07/09
ATtiny25/45/85
Figure 8-2.
MCU Start-up, RESET Tied to V
CC
Figure 8-3.
MCU Start-up, RESET Extended Externally
Table 8-1.
Power On Reset Specifications
Note:
1. Before rising the supply has to be between VPORMIN and VPORMAX to ensure Reset.
8.4
External Reset
An External Reset is generated by a low level on the RESET pin if enabled. Reset pulses longer
than the minimum pulse width (see Table 8-1) will generate a reset, even if the clock is not run-
ning. 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.
Symbol
Parameter
Min
Typ
Max
Units
V
POT
Power-on Reset Threshold Voltage (rising)
1.1
1.4
1.7
V
Power-on Reset Threshold Voltage (falling)(1)
0.8
1.3
1.6
V
V
PORMAX
VCC Max. start voltage to ensure internal
Power-on Reset signal
0.4
V
VPORMIN
VCC Min. start voltage to ensure internal
Power-on Reset signal
-0.1
V
VCCRR
VCC Rise Rate to ensure Power-on Reset
0.01
V/ms
VRST
RESET Pin Threshold Voltage
0.1 V
CC
0.9V
CC
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
RST
V
PORMA
X
VCC
CCRR
V
V
PORMIN
RESET
TIME-OUT
INTERNAL
RESET
tTOUT
VRST
VCC
V
POT



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