1 /* ----------------------------------------------------------------------------
\r
2 * SAM Software Package License
\r
3 * ----------------------------------------------------------------------------
\r
4 * Copyright (c) 2012, Atmel Corporation
\r
6 * All rights reserved.
\r
8 * Redistribution and use in source and binary forms, with or without
\r
9 * modification, are permitted provided that the following conditions are met:
\r
11 * - Redistributions of source code must retain the above copyright notice,
\r
12 * this list of conditions and the disclaimer below.
\r
14 * Atmel's name may not be used to endorse or promote products derived from
\r
15 * this software without specific prior written permission.
\r
17 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
\r
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
\r
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
\r
20 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
\r
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
\r
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
\r
23 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
\r
24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
\r
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
\r
26 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\r
27 * ----------------------------------------------------------------------------
\r
30 /*----------------------------------------------------------------------------
\r
32 *----------------------------------------------------------------------------*/
\r
38 /*----------------------------------------------------------------------------
\r
40 *----------------------------------------------------------------------------*/
\r
42 /*----------------------------------------------------------------------------
\r
44 *----------------------------------------------------------------------------*/
\r
48 /*----------------------------------------------------------------------------
\r
50 *----------------------------------------------------------------------------*/
\r
55 * \brief Select external 32K Crystal.
\r
58 * There's no option to return to internal slow RC after switching to ext 32kHz crystal.
\r
61 extern void SUPC_SelectExtCrystal32K(void)
\r
63 PMC_EnableXT32KFME();
\r
64 /* Select XTAL 32k instead of internal slow RC 32k for slow clock */
\r
65 if ( (SUPC->SUPC_SR & SUPC_SR_OSCSEL) != SUPC_SR_OSCSEL_CRYST )
\r
67 SUPC->SUPC_CR = SUPC_CR_KEY_PASSWD | SUPC_CR_XTALSEL_CRYSTAL_SEL;
\r
69 while( !(SUPC->SUPC_SR & SUPC_SR_OSCSEL) );
\r