ST72325 STMICROELECTRONICS [STMicroelectronics], ST72325 Datasheet - Page 58
![no-image](/images/no-image-200.jpg)
ST72325
Manufacturer Part Number
ST72325
Description
8-BIT MCU WITH 16 TO 60K FLASH/ROM, ADC, CSS, FIVE TIMERS, SPI, SCI, I2C INTERFACE
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.ST72325.pdf
(193 pages)
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ST72325
WATCHDOG TIMER (Cont’d)
Figure 37. Exact Timeout Duration (t
58/193
WHERE:
t
t
t
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 (t
IF
To calculate the maximum Watchdog Timeout (t
IF
Note: In the above formulae, division results must be rounded down to the next integer value.
Example:
With 2ms timeout selected in MCCSR register
min0
max0
OSC2
WDGCR Register (Hex.)
(MCCSR Reg.)
Value of T[5:0] Bits in
CNT
CNT
TB1 Bit
= (LSB + 128) x 64 x t
= 16384 x t
= 125ns if f
0
0
1
1
≤
<
MSB
-------------
MSB
-------------
3F
00
4
4
(MCCSR Reg.)
OSC2
OSC2
TB0 Bit
THEN
ELSE
THEN
ELSE
0
1
0
1
=8 MHz
t
Min. Watchdog
t
max
t
min
Timeout (ms)
OSC2
t
max
min
1.496
=
=
t
Selected MCCSR
128
min
=
=
t
t
min0
max0
t
t
Timebase
min0
max0
10ms
25ms
2ms
4ms
min
+
+
+
+
and t
16384
16384
16384
16384
Max. Watchdog
Timeout (ms)
max
128.552
×
×
×
2.048
t
×
⎛
⎝
max
⎛
⎝
MSB
CNT
CNT
)
min
CNT
CNT
max
20
49
4
8
):
):
–
×
–
×
t
4CNT
---------------- -
LSB
osc2
MSB
t
4CNT
---------------- -
59
53
35
54
osc2
MSB
⎞
⎠
⎞
⎠
+
+
(
(
192
192
+
+
LSB
LSB
)
)
×
×
64
64
×
×
4CNT
---------------- -
MSB
4CNT
---------------- -
MSB
×
×
t
t
osc2
osc2
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