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ATmega16U4 датащи(PDF) 35 Page - ATMEL Corporation

номер детали ATmega16U4
подробное описание детали  8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller
PDF  408 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16U4 датащи(HTML) 35 Page - ATMEL Corporation

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35
7766D–AVR–01/09
ATmega16U4/ATmega32U4
Figure 2. Example of clock switching with wake-up from Device
Clock switch
Algorithm
Switch from external
clock to RC clock
if (Usb_suspend_detected())
// if (UDINT.SUSPI == 1)
{
Usb_ack_suspend();
// UDINT.SUSPI = 0;
Usb_freeze_clock();
// USBCON.FRZCLK = 1;
Disable_pll();
// PLLCSR.PLLE = 0;
Enable_RC_clock();
// CLKSEL0.RCE = 1;
while (!RC_clock_ready());
// while (CLKSTA.RCON != 1);
Select_RC_clock();
// CLKSEL0.CLKS = 0;
Disable_external_clock();
// CLKSEL0.EXTE = 0;
}
Switch from RC clock to
external clock
if (Usb_wake_up_detected())
// if (UDINT.WAKEUPI == 1)
{
Usb_ack_wake_up();
// UDINT.WAKEUPI = 0;
Enable_external_clock();
// CKSEL0.EXTE = 1;
while (!External_clock_ready()); // while (CLKSTA.EXTON != 1);
Select_external_clock();
// CLKSEL0.CLKS = 1;
Enable_pll();
// PLLCSR.PLLE = 1;
Disable_RC_clock();
// CLKSEL0.RCE = 0;
while (!Pll_ready());
// while (PLLCSR.PLOCK != 1);
Usb_unfreeze_clock();
// USBCON.FRZCLK = 0;
}
Clock Selection
Register 0 – CLKSEL0
USB
CPU Clock
External
Oscillator
RC oscillator
Ext
RC
Ext
non-Idle
Idle
(Suspend)
non-Idle
3m
s
upstream-resume
2
2 Upstream Resume from device
w atchdog wake-up
fr om power- down
Bit
7
6
5
4
321
0
RCSUT1
RCSUT0
EXSUT1
EXSUT0
RCE
EXTE
-
CLKS
CLKSEL0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
Initial Value
0
0
0
0
See Bit Description



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