ATMEGA1280 datasheet(58/407 Pages) ATMEL

Part #	ATMEGA1280

Description	8- BIT Microcontroller with 256K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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58

ATmega640/1280/1281/2560/2561

2549A–AVR–03/05

Figure 25. Reset Logic

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 23. 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.

Table 23. Reset Characteristics

(1)

Symbol

Parameter

Condition

Min

Typ

Max

Units

VPOT

Power-on Reset Threshold

Voltage (rising)

TBD

V

Power-on Reset Threshold

Voltage (falling)(2)

TBD

V

VRST

RESET Pin Threshold Voltage

TBD

V

tRST

Minimum pulse width on RESET

TBD

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

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