#include "driverlib.h"

Macros
#define	CS_XT1_TIMEOUT 50000

#define	CS_XT2_TIMEOUT 0

#define	CS_XT1_CRYSTAL_FREQUENCY 32768

Functions
void	main (void)

void	NMI_ISR (void)

Variables
uint8_t	returnValue = 0

uint32_t	clockValue

uint16_t	status

Macro Definition Documentation

◆ CS_XT1_CRYSTAL_FREQUENCY

#define CS_XT1_CRYSTAL_FREQUENCY 32768

Definition at line 88 of file cs_ex4_XTSourcesDCOInternal.c.

◆ CS_XT1_TIMEOUT

#define CS_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. SMLCK for the CPU is supplied by the internal DCO. The 32kHz crystal connects between pins Xin and Xout. The DCO clock is generated internally and calibrated from the 32kHz crystal. ACLK is brought out on pin P1.1, SMCLK is brought out on P1.0.

ACLK = XT1 = 32768Hz, SMCLK = default DCO = 32 x ACLK = 1048576Hz

An external watch crystal between XIN & XOUT is required for ACLK

         MSP430FR2311
      -----------------
 /|\ |         XIN P2.6|-
  |  |                 | 32kHz
  ---|RST     XOUT P2.7|-
     |                 |
     |                 |
     |             P1.0|-->SMCLK = 1MHz
     |             P1.1|-->ACLK = 32kHz Crystal Out
     |                 |
     |                 |

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

CS 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.