conf_clock.h

/**
 * \file
 *
 * \brief SAM4S clock configuration.
 *
 * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
 *
 * \asf_license_start
 *
 * \page License
 *
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 * software and any derivatives exclusively with Microchip products.
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 * to your use of third party software (including open source software) that
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 *
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 * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
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/*
 * Support and FAQ: visit <a href="https://www.microchip.com/support/">Microchip Support</a>
 */

#ifndef CONF_CLOCK_H_INCLUDED
#define CONF_CLOCK_H_INCLUDED

// ===== System Clock (MCK) Source Options
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_SLCK_RC
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_SLCK_XTAL
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_SLCK_BYPASS
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_MAINCK_4M_RC
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_MAINCK_8M_RC
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_MAINCK_12M_RC
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_MAINCK_XTAL
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_MAINCK_BYPASS
#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_PLLACK
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_PLLBCK

// ===== System Clock (MCK) Prescaler Options   (Fmck = Fsys / (SYSCLK_PRES))
//#define CONFIG_SYSCLK_PRES          SYSCLK_PRES_1
#define CONFIG_SYSCLK_PRES          SYSCLK_PRES_2
//#define CONFIG_SYSCLK_PRES          SYSCLK_PRES_4
//#define CONFIG_SYSCLK_PRES          SYSCLK_PRES_8
//#define CONFIG_SYSCLK_PRES          SYSCLK_PRES_16
//#define CONFIG_SYSCLK_PRES          SYSCLK_PRES_32
//#define CONFIG_SYSCLK_PRES          SYSCLK_PRES_64
//#define CONFIG_SYSCLK_PRES          SYSCLK_PRES_3

// ===== PLL0 (A) Options   (Fpll = (Fclk * PLL_mul) / PLL_div)
// Use mul and div effective values here.
#define CONFIG_PLL0_SOURCE          PLL_SRC_MAINCK_XTAL
#define CONFIG_PLL0_MUL             20
#define CONFIG_PLL0_DIV             1

// ===== PLL1 (B) Options   (Fpll = (Fclk * PLL_mul) / PLL_div)
// Use mul and div effective values here.
//#define CONFIG_PLL1_SOURCE          PLL_SRC_MAINCK_XTAL
//#define CONFIG_PLL1_MUL             16
//#define CONFIG_PLL1_DIV             2

// ===== USB Clock Source Options   (Fusb = FpllX / USB_div)
// Use div effective value here.
#define CONFIG_USBCLK_SOURCE        USBCLK_SRC_PLL0
//#define CONFIG_USBCLK_SOURCE        USBCLK_SRC_PLL1
#define CONFIG_USBCLK_DIV           5

// ===== Target frequency (System clock)
// - XTAL frequency: 12MHz
// - System clock source: PLLA
// - System clock prescaler: 2 (divided by 2)
// - PLLA source: XTAL
// - PLLA output: XTAL * 20 / 1
// - System clock: 12 * 20 / 1 / 2 = 120MHz
// ===== Target frequency (USB Clock)
// - USB clock source: PLLB
// - USB clock divider: 2 (divided by 2)
// - PLLB output: XTAL * 16 / 2
// - USB clock: 12 * 16 / 2 / 2 = 48MHz


#endif /* CONF_CLOCK_H_INCLUDED */