Main Clock Control A

Name:
MCLKCTRLA
Offset:
0x00
Reset:
0x00
Access:
Configuration Change Protection
Bit76543210
CLKOUTCLKSEL[1:0]
AccessR/WR/WR/W
Reset000

Bit 7 – CLKOUT: System Clock Out

System Clock Out

When this bit is written to '1', the system clock is output to the CLKOUT pin. The CLKOUT pin is available for devices with 20 pins or more. See section I/O Multiplexing and Considerations for more information.

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 16/20 MHz internal oscillator
0x1 OSCULP32K 32.768 kHz internal ultra low-power oscillator
0x2 Reserved Reserved
0x3 EXTCLK External clock