ATmega3290P datasheet(331/385 Pages) ATMEL

331 / 385 page

331

8021E–AVR–07/09

ATmega329P/3290P

27.8

Brown-out Detection

Note:

1. 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 VCC = 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 = 10 for ATmega329P/3290PV and BODLEVEL = 01 for ATmega329P/3290P.

27.9

SPI Timing Characteristics

See Figure 27-4 and Figure 27-5 for details.

Notes:

1. In SPI Programming mode the minimum SCK high/low period is:

- 2 t

CLCL for fCK < 12 MHz

- 3 t

CLCL for fCK > 12 MHz

Table 27-5.

BODLEVEL Fuse Coding

(1)

BODLEVEL 1:0 Fuses

Min V

BOT

Typ V

BOT

Max V

BOT

Units

BOD Disabled

1.7

1.8

2.5

2.7

2.9

4.1

4.3

4.5

Table 27-6.

SPI Timing Parameters

Description

Mode

Min

Typ

Max

SCK period

Master

See Table 17-5 on page 165

SCK high/low

Master

50% duty cycle

Rise/Fall time

Master

3.6

Setup

Master

5Hold

Master

Out to SCK

Master

0.5 • tsck

SCK to out

Master

SCK to out high

Master

9SS low to out

Slave

SCK period

Slave

4 • tck

SCK high/low(1)

Slave

2 • tck

Rise/Fall time

Slave

1.6

µs

Setup

Slave

Hold

Slave

tck

SCK to out

Slave

SCK to SS high

Slave

SS high to tri-state

Slave

SS low to SCK

Slave

20 • tck

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