#include "driverlib.h"

Macros
#define	UCS_XT1_TIMEOUT 50000

#define	UCS_XT2_TIMEOUT 50000

#define	UCS_XT1_CRYSTAL_FREQUENCY 32768

#define	UCS_XT2_CRYSTAL_FREQUENCY 24000000

Functions
void	main (void)

void	NMI_ISR (void)

Variables
uint8_t	returnValue = 0

uint32_t	clockValue

uint16_t	status

Macro Definition Documentation

◆ UCS_XT1_CRYSTAL_FREQUENCY

#define UCS_XT1_CRYSTAL_FREQUENCY 32768

Definition at line 94 of file ucs_ex4_XTSourcesDCOInternal.c.

◆ UCS_XT1_TIMEOUT

#define UCS_XT1_TIMEOUT 50000

This program demonstrates using an external 32kHz crystal to supply ACLK, and using a high speed crystal or resonator to supply SMCLK. MLCK for the CPU is supplied by the internal DCO. The 32kHz crystal connects between pins Xin and Xout. The high frequency crystal or resonator connects between pins XT2IN and XT2OUT. The DCO clock is generated internally and calibrated from the 32kHz crystal. ACLK is brought out on pin P11.0, MCLK is brought out on P11.1, SMCLK is brought out on P11.2.

ACLK = LFXT1 = 32768Hz, MCLK = default DCO = 32 x ACLK = 1048576Hz SMCLK = HF XTAL An external watch crystal between XIN & XOUT is required for ACLK

         MSP430F54xA
      -----------------
 /|\ |              XIN|-
  |  |                 | 32kHz
  ---|RST          XOUT|-
     |                 |
     |                 |
     |            XT2IN|-
     |                 | HF XTAL or Resonator (add capacitors)
     |           XT2OUT|-
     |                 |
     |            P11.0|-->ACLK = 32kHz Crystal Out
     |                 |
     |            P11.1|-->MCLK
     |                 |
     |            P11.2|-->SMCLK = High Freq Xtal or Resonator Out

This example uses the following peripherals and I/O signals. You must review these and change as needed for your own board:

UCS module
GPIO Port peripheral

This example uses the following interrupt handlers. To use this example in your own application you must add these interrupt handlers to your vector table.