參數(shù)資料
型號: S80C32-44:RD
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 44 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 130/152頁
文件大小: 2528K
40
ATmega8535(L)
2502K–AVR–10/06
Watchdog Reset
When the Watchdog times out, it will generate a short reset pulse of one CK cycle dura-
tion. On the falling edge of this pulse, the delay timer starts counting the Time-out period
t
TOUT. Refer to page 41 for details on operation of the Watchdog Timer.
Figure 20. Watchdog Reset During Operation
MCU Control and Status
Register – MCUCSR
The MCU Control and Status Register provides information on which reset source
caused an MCU Reset.
Bit 3 – WDRF: Watchdog Reset Flag
This bit is set if a Watchdog Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
Bit 2 – BORF: Brown-out Reset Flag
This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
Bit 1 – EXTRF: External Reset Flag
This bit is set if an External Reset occurs. The bit is reset by a Power-on Reset, or by
writing a logic zero to the flag.
Bit 0 – PORF: Power-on Reset Flag
This bit is set if a Power-on Reset occurs. The bit is reset only by writing a logic zero to
the flag.
To make use of the Reset Flags to identify a reset condition, the user should read and
then reset the MCUCSR as early as possible in the program. If the register is cleared
before another reset occurs, the source of the reset can be found by examining the
Reset Flags.
CK
CC
Bit
765
432
10
ISC2
WDRF
BORF
EXTRF
PORF
MCUCSR
Read/Write
R/W
R
R/W
Initial Value
0
See Bit Description
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