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ATMEGA32 Datasheet(PDF) 36 Page - ATMEL Corporation

Part # ATMEGA32
Description  8-bit AVR Microcontroller with 32K Bytes In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA32 Datasheet(HTML) 36 Page - ATMEL Corporation

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36
ATmega32(L)
2503F–AVR–12/03
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 16. MCU Start-up, RESET Tied to V
CC.
Figure 17. MCU Start-up, RESET Extended Externally
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
CC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC


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