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ATMEGA165P Datasheet(PDF) 34 Page - ATMEL Corporation

Part No. ATMEGA165P
Description  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
Download  365 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATMEGA165P Datasheet(HTML) 34 Page - ATMEL Corporation

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34
8018A–AVR–03/06
ATmega165P
7.7
External Clock
To drive the device from an external clock source, XTAL1 should be driven as shown in Figure
7-4. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”.
Figure 7-4.
External Clock Drive Configuration
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table 7-12.
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the
MCU is kept in Reset during such changes in the clock frequency.
Note that the System Clock Prescaler can be used to implement run-time changes of the internal
clock frequency while still ensuring stable operation. Refer to ”System Clock Prescaler” on page
35 for details.
Table 7-11.
Crystal Oscillator Clock Frequency
CKSEL3..0
Frequency Range
0000
0 - 16 MHz
Table 7-12.
Start-up Times for the External Clock Selection
SUT1..0
Start-up Time from Power-
down and Power-save
Additional Delay from
Reset (V
CC = 5.0V)
Recommended Usage
00
6 CK
14CK
BOD enabled
01
6 CK
14CK + 4.1 ms
Fast rising power
10
6 CK
14CK + 65 ms
Slowly rising power
11
Reserved
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND


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