參數(shù)資料
型號: AV80C51C-36D
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 36 MHz, MICROCONTROLLER, PQFP44
封裝: 1.40 MM HEIGHT, QFP-44
文件頁數(shù): 99/170頁
文件大小: 4133K
代理商: AV80C51C-36D
34
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
For VLM voltage levels, see Table 16-6 on page 118.
8.4.3
RSTFLR – Reset Flag Register
The Reset Flag Register provides information on which reset source caused an MCU Reset.
Bits 7:4, 2– Res: Reserved Bits
These bits are reserved bits in ATtiny4/5/9/10 and will always read as zero.
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 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 MCUSR 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.
Table 8-4.
Setting the Trigger Level of Voltage Level Monitor.
VLM2:0
Label
Description
000
VLM0
Voltage Level Monitor disabled
001
VLM1L
Triggering generates a regular Power-On Reset (POR).
The VLM flag is not set
010
VLM1H
011
VLM2
Triggering sets the VLM Flag (VLMF) and generates a VLM
interrupt, if enabled
100
VLM3
101
Not allowed
110
111
Bit
765
4321
0
–WDRF
EXTRF
PORF
RSTFLR
Read/Write
R
R/W
R
R/W
Initial Value
0
X
0
X
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