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1/*
2** ###################################################################
3** Processor: LPC834M101FHI33
4** Compilers: GNU C Compiler
5** IAR ANSI C/C++ Compiler for ARM
6** Keil ARM C/C++ Compiler
7** MCUXpresso Compiler
8**
9** Reference manual: LPC83x User manual Rev.1.1 5 October 2016
10** Version: rev. 1.1, 2018-02-25
11** Build: b200526
12**
13** Abstract:
14** Provides a system configuration function and a global variable that
15** contains the system frequency. It configures the device and initializes
16** the oscillator (PLL) that is part of the microcontroller device.
17**
18** Copyright 2016 Freescale Semiconductor, Inc.
19** Copyright 2016-2020 NXP
20** All rights reserved.
21**
22** SPDX-License-Identifier: BSD-3-Clause
23**
24** http: www.nxp.com
25** mail: [email protected]
26**
27** Revisions:
28** - rev. 1.0 (2018-02-09)
29** Initial version.
30** - rev. 1.1 (2018-02-25)
31** Update some registers according to UM rev 1.2
32**
33** ###################################################################
34*/
35
36/*!
37 * @file LPC834
38 * @version 1.1
39 * @date 2018-02-25
40 * @brief Device specific configuration file for LPC834 (header file)
41 *
42 * Provides a system configuration function and a global variable that contains
43 * the system frequency. It configures the device and initializes the oscillator
44 * (PLL) that is part of the microcontroller device.
45 */
46
47#ifndef _SYSTEM_LPC834_H_
48#define _SYSTEM_LPC834_H_ /**< Symbol preventing repeated inclusion */
49
50#ifdef __cplusplus
51extern "C" {
52#endif
53
54#include <stdint.h>
55
56#define DEFAULT_SYSTEM_CLOCK 12000000u /* Default System clock value */
57#define CLK_RTC_32K_CLK 32768u /* RTC oscillator 32 kHz output (32k_clk */
58#define CLK_IRC_12MHZ 12000000u /* FRO 12 MHz (fro_12m) */
59#define CLK_OSC_IN 12000000u /* Oscillator input */
60#define EXT_CLK_IN 0u /* ext clkin */
61
62
63
64
65/**
66 * @brief System clock frequency (core clock)
67 *
68 * The system clock frequency supplied to the SysTick timer and the processor
69 * core clock. This variable can be used by the user application to setup the
70 * SysTick timer or configure other parameters. It may also be used by debugger to
71 * query the frequency of the debug timer or configure the trace clock speed
72 * SystemCoreClock is initialized with a correct predefined value.
73 */
74extern uint32_t SystemCoreClock;
75
76/**
77 * @brief Setup the microcontroller system.
78 *
79 * Typically this function configures the oscillator (PLL) that is part of the
80 * microcontroller device. For systems with variable clock speed it also updates
81 * the variable SystemCoreClock. SystemInit is called from startup_device file.
82 */
83void SystemInit (void);
84
85/**
86 * @brief Updates the SystemCoreClock variable.
87 *
88 * It must be called whenever the core clock is changed during program
89 * execution. SystemCoreClockUpdate() evaluates the clock register settings and calculates
90 * the current core clock.
91 */
92void SystemCoreClockUpdate (void);
93
94/**
95 * @brief SystemInit function hook.
96 *
97 * This weak function allows to call specific initialization code during the
98 * SystemInit() execution.This can be used when an application specific code needs
99 * to be called as close to the reset entry as possible (for example the Multicore
100 * Manager MCMGR_EarlyInit() function call).
101 * NOTE: No global r/w variables can be used in this hook function because the
102 * initialization of these variables happens after this function.
103 */
104void SystemInitHook (void);
105
106#ifdef __cplusplus
107}
108#endif
109
110#endif /* _SYSTEM_LPC834_H_ */