參數(shù)資料
型號(hào)： ST62P32BQ6
英文描述： 8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. ADC. 16-BIT AUTO-RELOAD TIMER. EEPROM. SPI. UART & 52. 42 PINS
中文描述： 8位微控制器（MCU）的與檢察官辦公室。光盤。 FASTROM。存儲(chǔ)器。 ADC的。 16位自動(dòng)重加載定時(shí)器。 EEPROM中。的SPI。異步
文件頁數(shù)： 28/84頁
文件大小： 918K
代理商： ST62P32BQ6
28/84
ST62T53C/T60C/T63C ST62E60C
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 18
.
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 18. 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
相關(guān)PDF資料
PDF描述
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