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ATmega48 Datasheet(PDF) 301 Page - ATMEL Corporation

No. de pieza ATmega48
Descripción Electrónicos  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  340 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega48 Datasheet(HTML) 301 Page - ATMEL Corporation

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7530H–AVR–02/09
ATmega48/88/168 Automotive
26.5
Maximum Speed vs. V
CC
Maximum frequency is dependent on V
CC. As shown in Figure 26-2, the Maximum Frequency vs.
V
CC curve is linear between 2.7V < VCC < 4.5V.
Figure 26-2. Maximum Frequency vs. V
CC, ATmega48/88/168
26.6
LIN Re-synchronization algorithm
26.7
Synchronization Algorithm
The possibility to change the value of OSCCAL during the Oscillator operation allows for in-situ
calibration of the slave node to entering Master frames. The principle of operation is to measure
the TBit during the SYNCH Byte and to change the calibration value of OSCCAL to recover from
local frequency drifts due to local voltage or temperature deviation. The algorithm used for the
synchronization of the internal RC oscillator is depicted in Figure 26-3
16 MHz
8 MHz
2.7V
4.5V
5.5V
Safe Operating Area



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