ATMEGA8515_10 datasheet(38/257 Pages) ATMEL

Part #	ATMEGA8515

Description	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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38

ATmega8515(L)

2512K–AVR–01/10

External RC Oscillator

For timing insensitive applications, the external RC configuration shown in Figure 20

can be used. The frequency is roughly estimated by the equation f = 1/(3RC). C should

be at least 22 pF. By programming the CKOPT Fuse, the user can enable an internal

36 pF capacitor between XTAL1 and GND, thereby removing the need for an external

capacitor.

Figure 20. External RC Configuration

The Oscillator can operate in four different modes, each optimized for a specific fre-

quency range. The operating mode is selected by the fuses CKSEL3..0 as shown in

Table 10.

When this Oscillator is selected, start-up times are determined by the SUT Fuses as

shown in Table 11.

Note:

1. This option should not be used when operating close to the maximum frequency of

the device.

Table 10. External RC Oscillator Operating Modes

CKSEL3..0

Frequency Range (MHz)

0101

0.1 - 0.9

0110

0.9 - 3.0

0111

3.0 - 8.0

1000

8.0 - 12.0

Table 11. Start-up Times for the External RC Oscillator Clock Selection

SUT1..0

Start-up Time

from Power-down

Additional Delay from

Reset (VCC = 5.0V)

Recommended Usage

00

18 CK

–

BOD enabled

01

18 CK

4.1 ms

Fast rising power

10

18 CK

65 ms

Slowly rising power

11

6 CK(1)

4.1 ms

Fast rising power or BOD

enabled

XTAL2

XTAL1

GND

C

R

VCC

NC

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