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参数资料
型号： MB9AF314MPMC
元件分类： 微控制器/微处理器
英文描述： 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP80
封装： 0.50 MM PITCH, PLASTIC, LQFP-80
文件页数： 54/114页
文件大小： 1357K
代理商： MB9AF314MPMC
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
44
11.6
Watchdog System 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 tTOUT. Refer to Section 11.8 “Watchdog Timer” on page 45 for details on
operation of the watchdog timer.
Figure 11-6. Watchdog System Reset During Operation
11.7
Internal Voltage Reference
The Atmel ATmega48PA/88PA/168PA features an internal bandgap reference. This reference is used for brown-out
detection, and it can be used as an input to the analog comparator or the ADC.
11.7.1 Voltage Reference Enable Signals and Start-up Time
The voltage reference has a start-up time that may influence the way it should be used. The start-up time is given in
Section 29.5 “System and Reset Characteristics” on page 272. To save power, the reference is not always turned on. The
reference is on during the following situations:
1.
When the BOD is enabled (by programming the BODLEVEL [2:0] fuses).
2.
When the bandgap reference is connected to the analog comparator (by setting the ACBG bit in ACSR).
3.
When the ADC is enabled.
Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC, the user must always allow the
reference to start up before the output from the analog comparator or ADC is used. To reduce power consumption in power-
down mode, the user can avoid the three conditions above to ensure that the reference is turned off before entering power-
down mode.
1 CK Cycle
V
CC
RESET
INTERNAL
RESET
Time-OUT
WDT
TIME-OUT
t
TOUT
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