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參數(shù)資料
| 型號： | st62E18C |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-Bit MCUs with A/D Converter, Auto-Reload Timer, UART, OSG, Safe Reset and 20-Pin Package(8位微控制器(8M)) |
| 中文描述： | 8位微控制器與A / D轉(zhuǎn)換器，自動重加載定時(shí)器，UART的秘書長辦公室，安全復(fù)位和20引腳封裝（8位微控制器（8米）） |
| 文件頁數(shù)： | 25/82頁 |
| 文件大?。?/td> | 943K |
| 代理商： | ST62E18C |
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ST62T18C/E18C
DIGITAL WATCHDOG
(Cont’d)
The Watchdog is associated with a Data space
register (Digital WatchDog Register, DWDR, loca-
tion 0D8h) which is described in greater detail in
Section 3.3.1 Digital Watchdog Register (DWDR)
.
This register is set to 0FEh on Reset: bit C is
cleared to “0”, which disables the Watchdog; the
timer downcounter bits, T0 to T5, and the SR bit
are all set to “1”, thus selecting the longest Watch-
dog timer period. This time period can be set to the
user’s requirements by setting the appropriate val-
ue for bits T0 to T5 in the DWDR register. The SR
bit must be set to “1”, since it is this bit which gen-
erates the Reset signal when it changes to “0”;
clearing this bit would generate an immediate Re-
set.
It should be noted that the order of the bits in the
DWDR register is inverted with respect to the as-
sociated bits in the down counter: bit 7 of the
DWDR register corresponds, in fact, to T0 and bit
2 to T5. The user should bear in mind the fact that
these bits are inverted and shifted with respect to
the physical counter bits when writing to this regis-
ter. The relationship between the DWDR register
bits and the physical implementation of the Watch-
dog timer downcounter is illustrated in
Figure 60
.
Only the 6 most significant bits may be used to de-
fine the time period, since it is bit 6 which triggers
the Reset when it changes to “0”. This offers the
user a choice of 64 timed periods ranging from
3,072 to 196,608 clock cycles (with an oscillator
frequency of 8MHz, this is equivalent to timer peri-
ods ranging from 384μs to 24.576ms).
Figure 60. Watchdog Counter Control
W
D0
D1
D3
D4
D5
D6
D7
W
C
SR
T5
T4
T3
T2
T1
D2
T0
OSC
÷
12
RESET
VR02068A
÷
2
8
185
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST62E18CF1 | 功能描述:8位微控制器 -MCU UV EPROM 8K UART RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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| ST62E20BB1/EPROM | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET |
| ST62E20BB3/EPROM | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET |
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