ATmega16 datasheet(38/357 Pages) ATMEL

38 / 357 page

2466S–AVR–05/09

ATmega16(L)

Figure 15. Reset Logic

Notes:

1. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling).

2. V

BOT may be below nominal minimum operating voltage for some devices. For devices where

this is the case, the device is tested down to V

CC = VBOT during the production test. This guar-

antees that a Brown-out Reset will occur before VCC drops to a voltage where correct

operation of the microcontroller is no longer guaranteed. The test is performed using

BODLEVEL = 1 for ATmega16L and BODLEVEL = 0 for ATmega16. BODLEVEL = 1 is not

applicable for ATmega16.

Table 15. Reset Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

VPOT

Power-on Reset

Threshold Voltage (rising)

1.4

2.3

Power-on Reset

Threshold Voltage

(falling)(1)

1.3

2.3

VRST

RESET Pin Threshold

Voltage

0.1 V

0.9V

tRST

Minimum pulse width on

RESET Pin

1.5

µs

VBOT

Brown-out Reset

Threshold Voltage(2)

BODLEVEL = 1

2.5

2.7

3.2

BODLEVEL = 0

3.6

4.0

4.5

tBOD

Minimum low voltage

period for Brown-out

Detection

BODLEVEL = 1

µs

BODLEVEL = 0

µs

HYST

Brown-out Detector

hysteresis

MCU Control and Status

BODEN

BODLEVEL

Delay Counters

CKSEL[3:0]

TIMEOUT

DATA BUS

Clock

Generator

SPIKE

FILTER

Pull-up Resistor

JTAG Reset

Watchdog

Oscillator

SUT[1:0]

Watchdog

Timer

Reset Circuit

Brown-out

Reset Circuit

Power-on

Reset Circuit

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