ATmega16 datasheet(35/315 Pages) ATMEL

35 / 315 page

ATmega16(L)

2466E–AVR–10/02

Figure 15. Reset Logic

Notes:

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

(falling).

2. VBOT 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 guarantees that a Brown-out Reset will occur before V

CC 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

0.2 VCC

0.85VCC

tRST

Minimum pulse width on

RESET Pin

VBOT

Brown-out Reset

Threshold Voltage

(2)

BODLEVEL = 1

2.5

2.7

3.2

BODLEVEL = 0

3.7

4.0

4.2

tBOD

Minimum low voltage

period for Brown-out

Detection

BODLEVEL = 1

µs

BODLEVEL = 0

µs

VHYST

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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