ATmega16 datasheet(29/315 Pages) ATMEL

tên linh kiện	ATMEGA16

Giải thích chi tiết về linh kiện	8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash

PDF	315 Pages

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nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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ATmega16(L)

2466E–AVR–10/02

External Clock

To drive the device from an external clock source, XTAL1 should be driven as shown in

Figure 14. To run the device on an external clock, the CKSEL fuses must be pro-

grammed to “0000”. By programming the CKOPT Fuse, the user can enable an internal

36 pF capacitor between XTAL1 and GND.

Figure 14. External Clock Drive Configuration

When this clock source is selected, start-up times are determined by the SUT fuses as

shown in Table 12.

Timer/Counter Oscillator

For AVR microcontrollers with Timer/Counter Oscillator pins (TOSC1 and TOSC2), the

crystal is connected directly between the pins. No external capacitors are needed. The

Oscillator is optimized for use with a 32.768 kHz watch crystal. Applying an external

clock source to TOSC1 is not recommended.

Table 12. Start-up Times for the External Clock Selection

SUT1..0

Start-up Time from

Power-down and

Power-save

Additional Delay

from Reset

CC = 5.0V)

Recommended Usage

6 CK

–

BOD enabled

6 CK

4.1 ms

Fast rising power

6 CK

65 ms

Slowly rising power

Reserved

EXTERNAL

CLOCK

SIGNAL

ATMEGA16 bảng dữ liệu(PDF) 29 Page - ATMEL Corporation