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ST72321AR6 Datasheet

  • ST72321AR6

  • 8-BIT MCU WITH NESTED INTERRUPTS, FLASH,10-BIT ADC, FIVE TIM...

  • 2302.91KB

  • STMicroelectronics   STMicroelectronics

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ST72321
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
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
54/185
+
錚?/div>
錚?/div>
鈥?/div>
ELSE
t max = tmax0 + 16384
脳
C NT
錚?/div>
錚?/div>
+
IF
CNT
鈮?/div>
MSB
-------------
THEN
t ma x = tmax0
16384
脳
C NT
脳
tosc2
4CNT
----------------
-
MSB
4CNT
-
(
192 + LSB
) 脳
64
脳
----------------
MSB
脳
t osc2
+
錚?/div>
錚?/div>
鈥?/div>
ELSE
t min = tmin0 + 16384
脳
CN T
錚?/div>
錚?/div>
+
IF
CNT < MSB
-------------
THEN
tm in = tmin0
16384
脳
CNT
脳
t osc2
4 CNT
----------------
-
MSB
4CNT
-
(
192 + LS B
) 脳
64
脳
----------------
MSB
脳
t osc2

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