ATmega16M1 datasheet(47/365 Pages) ATMEL

47 / 365 page

7647F–AVR–04/09

ATmega16/32/64/M1/C1

Figure 7-1.

Reset Logic

Note:

1. Before rising, the supply has to be between

PORMIN and VPORMAX to ensure a Reset.

7.2.1

Power-on Reset

A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level

is defined in Table 7-1. 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. Reaching 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 7-1.

Reset Characteristics

Symbol

Parameter

Min

Typ

Max

Units

VPOT

Power-on Reset Threshold Voltage (rising)

1.1

1.4

1.7

Power-on Reset Threshold Voltage (falling)(1)

0.8

0.9

1.6

PORMAX

VCC Max. start voltage to ensure internal

Power-on Reset signal

0.4

VPORMIN

VCC Min. start voltage to ensure internal

Power-on Reset signal

-0.1

VCCRR

VCC Rise Rate to ensure Power-on Reset

0.01

V/ms

VRST

RESET Pin Threshold Voltage

0.1 V

0.9V

MCU Status

Brown-out

Reset Circuit

BODLEVEL [2..0]

Delay Counters

CKSEL[3:0]

TIMEOUT

DATA BUS

Clock

Generator

Spike

Filter

Pull-up Resistor

Watchdog

Oscillator

SUT[1:0]

Power-on Reset

Circuit

ATmega16M1 Datasheet(PDF) 47 Page - ATMEL Corporation

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