36.10.5 System Clock

Table 36-14. System Clock Timing Characteristics
Symbol	Description	Min.	Typ. ✝	Max.	Unit	Conditions
f_{CLK_MAIN}	Main clock frequency, industrial temperature range⁽¹⁾	0	—	5	MHz	-40°C ≤ T_A ≤ +85°C V_DD ≥ 1.8V
		0	—	10	MHz	-40°C ≤ T_A ≤ +85°C V_DD ≥ 2.7V
		0	—	20	MHz	-40°C ≤ T_A ≤ +85°C V_DD ≥ 4.5V
	Main clock frequency, extended temperature range⁽¹⁾	0	—	8	MHz	-40°C ≤ T_A ≤ +125°C V_DD ≥ 2.7V
	Main clock frequency, extended temperature range⁽¹⁾	0	—	16	MHz	-40°C ≤ T_A ≤ +125°C V_DD ≥ 4.5V
f_TCF	TCF clock frequency, industrial temperature range	—	—	20	MHz	-40°C ≤ T_A ≤ +85°C V_DD ≥ 1.8V
		—	—	40	MHz	-40°C ≤ T_A ≤ +85°C V_DD ≥ 2.7V
		—	—	80	MHz	-40°C ≤ T_A ≤ +85°C V_DD ≥ 4.5V
	TCF clock frequency, extended temperature range	—	—	64	MHz	-40°C ≤ T_A ≤ +125°C V_DD ≥ 4.5V
f_CY	Instruction clock frequency	—	f_{CLK_MAIN}	—	MHz
T_CY	Instruction period⁽²⁾	50	1/f_CY	—	ns
✝ Unless otherwise specified, data in the “Typ.” column is at T_A = 25°C and V_DD = 3.0V . These parameters are not tested and are for design guidance only. Note: The main clock frequency (CLK_MAIN) is configured by the Clock Select (CLKSEL) bit field, as described in the CLKCTRL - Clock Controller section. Instruction Cycle Period (T_CY) is equivalent to the input oscillator time-base period. All specified values are based on characterization data for that particular oscillator type under standard operating conditions with the device executing code. Exceeding these specified limits may result in incorrect code execution and/or higher-than-expected current consumption. All devices are tested to operate at ‘min’ values with an external clock applied to the EXTCLK pin. When using an external clock input, the ‘max’ cycle time limit is ‘DC’ (no clock) for all devices.