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ST72324 Datasheet(PDF) 53 Page - STMicroelectronics

Part # ST72324
Description  8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72324 Datasheet(HTML) 53 Page - STMicroelectronics

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WATCHDOG TIMER (Cont’d)
Figure 34. Exact Timeout Duration (tmin and tmax)
WHERE:
tmin0 = (LSB + 128) x 64 x tOSC2
tmax0 = 16384 x tOSC2
tOSC2 = 125ns if fOSC2=8 MHz
CNT = Value of T[5:0] bits in the WDGCR register (6 bits)
MSB and LSB are values from the table below depending on the timebase selected by the TB[1:0] bits
in the MCCSR register
To calculate the minimum Watchdog Timeout (tmin):
IF
THEN
ELSE
To calculate the maximum Watchdog Timeout (tmax):
IF
THEN
ELSE
Note: In the above formulae, division results must be rounded down to the next integer value.
Example:
With 2ms timeout selected in MCCSR register
TB1 Bit
(MCCSR Reg.)
TB0 Bit
(MCCSR Reg.)
Selected MCCSR
Timebase
MSB
LSB
0
0
2ms
4
59
0
1
4ms
8
53
1
0
10ms
20
35
1
1
25ms
49
54
Value of T[5:0] Bits in
WDGCR Register (Hex.)
Min. Watchdog
Timeout (ms)
tmin
Max. Watchdog
Timeout (ms)
tmax
00
1.496
2.048
3F
128
128.552
CNT
MSB
4
-------------
<
t
min
t
min0
16384
CNT
t
osc2
×
×
+
=
t
min
t
min0
16384
CN T
4 CNT
MSB
-----------------
–


×
192
LS B
+
() 64
4CNT
MSB
-----------------
×
×
+
t
osc2
×
+
=
CNT
MSB
4
-------------
≤
t
ma x
t
max0
16384
C NT
t
osc2
×
×
+
=
t
max
t
max0
16384
C NT
4CNT
MSB
-----------------
–


×
192
LSB
+
() 64
4CNT
MSB
-----------------
×
×
+
t
osc2
×
+
=


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