ATA8743-PXQW【PDF 59/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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Sheet目录52

55页 56页 57页 58页 [59页]60页 61页 62页 63页

9152BINDCO02/10

ATA8743

16.0.5

Brown-out Detection

ATtiny24/44/84 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V

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

+ V

HYST

/2 and V

BOT-

= V

BOT

- V

HYST

/2.

When the BOD is enabled, and V

decreases to a value below the trigger level (V

BOT-

in Figure

16-5 on page 59), the Brown-out Reset is immediately activated. When V

increases above the

trigger level (V

BOT+

in Figure 16-5 on page 59), 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

if the voltage stays below the trigger level for lon-

ger than t

BOD

given in System and Reset Characterizations on page 198.

Figure 16-5. Brown-out Reset During Operation

16.0.6

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

. See

Watchdog Timer on page 60 for details on operation of the Watchdog Timer.

Figure 16-6. Watchdog Reset During Operation

RESET

IME-OUT

NTERNAL

RE ET

BOT-

BOT+

TOUT

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