ATMEGA169P-16MCHR【PDF 221/274 页】MCU AVR 16KB FLASH 16MHZ 64-VQFN

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8018P–AVR–08/10

ATmega169P

10.2.3

Brown-out Detection

ATmega169P has an On-chip Brown-out Detection (BOD) circuit for monitoring the V

CC level

during operation by comparing it to a fixed trigger level. The trigger level for the BOD can be

selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike free

Brown-out Detection. The hysteresis on the detection level should be interpreted as V

BOT+ =

BOT + VHYST/2 and VBOT- = VBOT - VHYST/2.When the BOD is enabled, and VCC decreases to a

value below the trigger level (V

BOT- in Figure 10-5), the Brown-out Reset is immediately acti-

vated. When V

CC increases above the trigger level (VBOT+ in Figure 10-5), the delay counter

starts the MCU after the Time-out period t

TOUT has expired.

The BOD circuit will only detect a drop in V

CC if the voltage stays below the trigger level for lon-

ger than t

BOD given in ”System and Reset Characteristics” on page 333.

Figure 10-5. Brown-out Reset During Operation

10.2.4

Watchdog Reset

When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On

the falling edge of this pulse, the delay timer starts counting the Time-out period t

TOUT. Refer to

”Watchdog Timer” on page 51 for details on operation of the Watchdog Timer.

Figure 10-6. Watchdog Reset During Operation

VCC

RESET

TIME-OUT

INTERNAL

RESET

VBOT-

VBOT+

tTOUT

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