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ATTINY2313 Datasheet(PDF) 35 Page - ATMEL Corporation

Part No. ATTINY2313
Description  8-bit AVR Microcontroller with 2K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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 35 page
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35
ATtiny2313/V
2543C–AVR–12/03
Figure 16. MCU Start-up, RESET Extended Externally
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 15) 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 17. External Reset During Operation
Brown-out Detection
ATtiny2313 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
CC
level during operation by comparing it to a fixed trigger level. The trigger level for the
BOD can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to
ensure spike free Brown-out Detection. The hysteresis on the detection level should be
interpreted as V
BOT+ = VBOT + VHYST/2 and VBOT- = VBOT - VHYST/2.
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
CC
Table 16. BODLEVEL Fuse Coding
(1)
BODLEVEL 2..0 Fuses
Min VBOT
Typ VBOT
Max VBOT
Units
111
BOD Disabled
110
1.8
V
101
2.7
100
4.3




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