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ATTINY2313 Datasheet(PDF) 34 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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 34 page
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34
ATtiny2313/V
2543C–AVR–12/03
Notes:
1. Values are guidelines only. Actual values are TBD.
2. The Power-on Reset will not work unless the supply voltage has been below VPOT
(falling)
Power-on Reset
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detec-
tion 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. Reach-
ing 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 15. MCU Start-up, RESET Tied to V
CC
Table 15. Reset Characteristics
Symbol
Parameter
Condition
Min
(1)
Typ
(1)
Max
(1)
Units
VPOT
Power-on Reset
Threshold Voltage
(rising)
TA = -40 - 85°C1.2
V
Power-on Reset
Threshold Voltage
(falling)(2)
TA = -40 - 85°C1.1
V
VRST
RESET Pin Threshold
Voltage
VCC = 1.8 - 5.5V
0.1 VCC
0.9 VCC
V
tRST
Minimum pulse width
on RESET Pin
V
CC = 1.8 - 5.5V
2.5
µs
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
CC




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