AT90PWM161 datasheet(37/327 Pages) ATMEL

tên linh kiện	AT90PWM161

Giải thích chi tiết về linh kiện	131 powerful instructions - most single clock cycle execution

PDF	327 Pages

Scroll/Zoom	100%

nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

Logo

37 / 327 page

7734Q–AVR–02/12

AT90PWM81/161

Clock stability before switching

Once the new clock source is selected, the count procedure is running. The user (code)

should wait for the setting of the CLKRDY flag in CLKSCR register before to perform a

switching.

Clock available on request

AT any time, the user (code) can ask for the availability of a clock source. The user (code)

can request it writing the appropriate command in the CLKSCR register. A full status on

clock sources then can be done.

5.3.6

Clock Switching

To drive the system clock, the user can switch from the current clock source to the following

ones (one of them is the current clock source):

Calibrated internal RC oscillator 8.0MHz/1.0MHz,

Internal watchdog oscillator 128kHz,

External clock,

External Crystal/Ceramic Resonator,

PLL output divided by four.

The clock switching is performed in a sequence of commands. First, the user (code) must make

sure that the new clock source is running. Then the switching command can be entered. At the

end, the user (code) can stop the previous clock source. It will be better to run this sequence

once the interrupts disabled. The user (code) has the responsibility of the clock switching

sequence.

AT90PWM161 bảng dữ liệu(PDF) 37 Page - ATMEL Corporation