38.4.5 Reset, WDT, Oscillator Start-up Timer, Power-up Timer, Brown-out Reset and Low-Power Brown-out Reset Specifications

Figure 38-7. Reset, Watchdog Timer, Oscillator Start-up Timer and Power-up Timer Timing

Figure 38-8. Brown-out Reset Timing and Characteristics

Table 38-11.
Standard Operating Conditions (unless otherwise stated)
Param No.	Sym.	Characteristic	Min.	Typ. †	Max.	Units	Conditions
RST01*	T_MCLR	MCLR Pulse Width Low to ensure Reset	2	—	—	μs
RST02*	T_IOZ	I/O high-impedance from Reset detection	—	—	2	μs
RST03	T_WDT	Watchdog Timer Time-out Period	—	16	—	ms	1:512 Prescaler
RST04*	T_PWRT	Power-up Timer Period	—	65	—	ms
RST05	T_OST	Oscillator Start-up Timer Period^(1,2)	—	1024	—	T_OSC
RST06	V_BOR	Brown-out Reset Voltage	2.7 2.55 2.3 1.8	2.85 2.7 2.45 1.9	3.0 2.85 2.6 2.1	V V V V	BORV=`00` BORV=`01` BORV=`10` BORV=`11`
RST07	V_BORHYS	Brown-out Reset Hysteresis	—	44	—	mV	BORV=`11`
RST08	T_BORDC	Brown-out Reset Response Time	—	3	—	μs
RST09	V_LPBOR	Low-Power Brown-out Reset Voltage	—	1.9	—	V
* - These parameters are characterized but not tested. † Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested. Note: By design, the Oscillator Start-up Timer (OST) counts the first 1024 cycles, independent of frequency. To ensure these voltage tolerances, V_DD and V_SS must be capacitively decoupled as close to the device as possible. 0.1 μF and 0.01 μF values in parallel are recommended.