Main Clock Control A
Name:
MCLKCTRLA
Offset:
0x00
Reset:
0x00
Access:
Configuration Change Protection
Bit76543210
CLKOUTCLKSEL[1:0]
AccessR/WRRRRRR/WR/W
Reset00000000

Bit 7 – CLKOUT: System Clock Out

System Clock Out

When this bit is written to '1', the system clock is output to CLKOUT pin.

When the device is in a sleep mode, there is no clock output unless a peripheral is using the system clock.

Bits 1:0 – CLKSEL[1:0]: Clock Select

Clock Select

This bit field selects the source for the Main Clock (CLK_MAIN).

ValueNameDescription
0x0 OSC20M 16/20MHz internal oscillator
0x1 OSCULP32K 32KHz internal Ultra Low Power oscillator
0x2 XOSC32K 32.768kHz external crystal oscillator
0x3 EXTCLK External clock