CPU clock source MSP4300G2553 microcontroller in the numerical control oscillator DCO. CPU by long delay control P1.6 LED flashing light. Single chip microcomputer identification P1.3 mechanical keys, change the DCO parameter, which is set to 1M, 8M, 12M and 16MHz, can be observed in the flicker frequency increase.

4_KEY_LED_Change_DCO\4_KEY_LED_Change_DCO.dep
....................\4_KEY_LED_Change_DCO.ewd
....................\4_KEY_LED_Change_DCO.ewp
....................\4_KEY_LED_Change_DCO.eww
....................\4_KEY_LED_Change_DCOCustomSfr.sfr
....................\Debug\Exe\4_KEY_LED_Change_DCO.d43
....................\.....\Obj\4_KEY_LED_Change_DCO.pbd
....................\.....\...\4_KEY_LED_Change_DCO.pbd.browse
....................\.....\...\main.pbi
....................\.....\...\main.pbi.cout
....................\.....\...\main.r43
....................\main.c
....................\path.txt
....................\settings\4_KEY_LED_Change_DCO.cspy.bat
....................\........\4_KEY_LED_Change_DCO.dbgdt
....................\........\4_KEY_LED_Change_DCO.dni
....................\........\4_KEY_LED_Change_DCO.wsdt
....................\Debug\Exe
....................\.....\List
....................\.....\Obj
....................\Debug
....................\settings
4_KEY_LED_Change_DCO

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