ST72262G2 Datasheet

  • ST72262G2

  • 8-BIT MCU WITH FLASH OR ROM MEMORY, ADC, TWO 16-BIT TIMERS, ...

  • 2095.35KB

  • STMicroelectronics   STMicroelectronics

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ST72260G, ST72262G, ST72264G
WATCHDOG TIMER
(Cont鈥檇)
Figure 34. Exact Timeout Duration (t
min
and t
max
)
WHERE:
t
min0
= (LSB + 128) x 64 x t
OSC2
t
max0
= 16384 x t
OSC2
t
OSC2
= 125ns if f
OSC2
=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
TB1 Bit
TB0 Bit
(MCCSR Reg.) (MCCSR Reg.)
0
0
0
1
1
0
1
1
Selected MCCSR
Timebase
2ms
4ms
10ms
25ms
MSB
4
8
20
49
LSB
59
53
35
54
To calculate the minimum Watchdog Timeout (t
min
):
4
To calculate the maximum Watchdog Timeout (t
max
):
4
max
Note:
In the above formulae, division results must be rounded down to the next integer value.
Example:
With 2ms timeout selected in MCCSR register
Value of T[5:0] Bits in
WDGCR Register (Hex.)
00
3F
Min. Watchdog
Timeout (ms)
t
min
1.496
128
Max. Watchdog
Timeout (ms)
t
max
2.048
128.552
50/171
+
铮?/div>
铮?/div>
鈥?/div>
铮?/div>
铮?/div>
ELSE
t
= t
+ 16384
C NT
m ax0
+
IF
CNT
鈮?/div>
MSB
-------------
THEN
t
max = t m ax0
16384
CNT
t osc2
4CNT
----------------
-
MSB
4CNT
-
(
192 + LSB
) 脳
64
----------------
MS B
铮?/div>
+
铮?/div>
鈥?/div>
ELSE
t min = tm in0 + 16384
CN T
铮?/div>
铮?/div>
+
IF
CNT < MSB
-------------
THEN
t min = t m in0
16384
CNT
t osc2
4 CNT
----------------
-
MSB
4CNT
-
(
192 + L SB
) 脳
64
----------------
MSB
tosc2
to sc2

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