Example Analysis:
1. The CPU runs under the VLO clock:
This is the slowest clock, running at about 12 kHz. Therefore, we will visualize the LED flashing red slowly at a rate of about every 3 seconds.
We can let the clock system default to this state and set it up specifically to operate VLO. We will not use any ALCK peripheral clocks in this lab,
but you should realize that ACLK comes from the VLO clock.
#include
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;
turn off the watchdog timer
P1DIR = 0x40;
configure output
P1OUT = 0;
turn off LED
BCSCTL3 |= LFXT1S_2;
IFG1 &= ~OFIFG;
clear OSCFault flag
__bis_SR_register(SCG1 + SCG0);
turn off DCO
BCSCTL2 |= SELM_3 + DIVM_3;
while(1)
{
P1OUT = 0x40;
turn on LED
_delay_cycles(100);
P1OUT = 0;
turn off LED
_delay_cycles(5000);
}
}
Keywords：MSP430
Reference address：MSP430 Clock Settings (Part 2)
1. The CPU runs under the VLO clock:
This is the slowest clock, running at about 12 kHz. Therefore, we will visualize the LED flashing red slowly at a rate of about every 3 seconds.
We can let the clock system default to this state and set it up specifically to operate VLO. We will not use any ALCK peripheral clocks in this lab,
but you should realize that ACLK comes from the VLO clock.
#include
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;
turn off the watchdog timer
P1DIR = 0x40;
configure output
P1OUT = 0;
turn off LED
BCSCTL3 |= LFXT1S_2;
IFG1 &= ~OFIFG;
clear OSCFault flag
__bis_SR_register(SCG1 + SCG0);
turn off DCO
BCSCTL2 |= SELM_3 + DIVM_3;
while(1)
{
P1OUT = 0x40;
turn on LED
_delay_cycles(100);
P1OUT = 0;
turn off LED
_delay_cycles(5000);
}
}
Previous article：MSP430 Clock Settings (Part 3)
Next article：MSP430 Clock Settings (I)
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