參數(shù)資料
型號： MV80C51C-20R
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP44
封裝： 1.40 MM HEIGHT, QFP-44
文件頁數(shù)： 98/170頁
文件大?。?/td> 4133K
代理商： MV80C51C-20R
33
ATtiny4/5/9/10 [DATASHEET]
8127F–AVR–02/2013
Bits 5, 2:0 – WDP3..0: Watchdog Timer Prescaler 3, 2, 1 and 0
The WDP3..0 bits determine the Watchdog Timer prescaling when the Watchdog Timer is running. The different
prescaling values and their corresponding time-out periods are shown in Table 8-3 on page 33.
8.4.2
VLMCSR – V
CC Level Monitoring Control and Status register
Bit 7 – VLMF: VLM Flag
This bit is set by the VLM circuit to indicate that a voltage level condition has been triggered (see Table 8-4). The
bit is cleared when the trigger level selection is set to “Disabled”, or when voltage at V
CC rises above the selected
trigger level.
Bit 6 – VLMIE: VLM Interrupt Enable
When this bit is set the VLM interrupt is enabled. A VLM interrupt is generated every time the VLMF flag is set.
Bits 5:3 – Res: Reserved Bits
These bits are reserved. For ensuring compatibility with future devices, these bits must be written to zero, when the
register is written.
Bits 2:0 – VLM2:0: Trigger Level of Voltage Level Monitor
These bits set the trigger level for the voltage level monitor, as described in Table 8-4 below.
Table 8-3.
Watchdog Timer Prescale Select
WDP3
WDP2
WDP1
WDP0
Number of WDT
Oscillator Cycles
Typical Time-out at
VCC = 5.0V
0
2K (2048) cycles
16 ms
0
1
4K (4096) cycles
32 ms
0
1
0
8K (8192) cycles
64 ms
0
1
16K (16384) cycles
0.125 s
0
1
0
32K (32768) cycles
0.25 s
0
1
0
1
64K (65536) cycles
0.5 s
0
1
0
128K (131072) cycles
1.0 s
0
1
256K (262144) cycles
2.0 s
1
0
512K (524288) cycles
4.0 s
1
0
1
1024K (1048576) cycles
8.0 s
1
010
Reserved
1
011
1
100
1
101
1
110
1
111
Bit
765
4321
0
VLMF
VLMIE
–
VLM2
VLM1
VLM0
VLMCSR
Read/Write
R
R/W
R
R/W
Initial Value
000
0000
0
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