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參數(shù)資料
| 型號(hào)： | ST624XB-DBE |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | REAL TIME EMULATION DEVELOPMENT TOOLS FOR ST6 MCU FAMILY |
| 中文描述： | 實(shí)時(shí)仿真開(kāi)發(fā)工具，ST6單片機(jī)系列 |
| 文件頁(yè)數(shù)： | 24/74頁(yè) |
| 文件大?。?/td> | 733K |
| 代理商： | ST624XB-DBE |
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ST62T46B/E46B
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 14
.
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 14. 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST624XB-KIT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:STARTER KIT DATASHEET FOR ST624X |
| ST624XB-KIT/110 | 功能描述:開(kāi)發(fā)板和工具包 - 其他處理器 ST624X Starter Kit RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評(píng)估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| ST624XB-KIT/UK | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ST62 KIT |
| ST6252 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, AUTO-RELOAD TIMER AND EEPROM |
| ST6252BB1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, AUTO-RELOAD TIMER AND EEPROM |
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