ST7FMC1K2B3 STMICROELECTRONICS [STMicroelectronics], ST7FMC1K2B3 Datasheet - Page 63

• Manufacturer Part Number: ST7FMC1K2B3
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

WINDOW WATCHDOG (Cont’d)
Figure 36. Exact Timeout Duration (t
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
(MCCSR Reg.)
WDGCR Register (Hex.)
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
-------------
00
3F
4
4
(MCCSR Reg.)
OSC2
OSC2
TB0 Bit
THEN
ELSE
THEN
ELSE
0
1
0
1
= 8 MHz
t
t
max
Min. Watchdog
min
t
t
Timeout (ms)
max
OSC2
min
=
=
1.496
t
Selected MCCSR
128
=
=
min
t
t
min0
max0
t
t
min0
max0
Timebase
10ms
25ms
2ms
4ms
min
+
+
+
+
16384
and t
16384
16384
16384
Max. Watchdog
Timeout (ms)
max
×
128.552
×
×
×
2.048
t
⎛
⎝
max
⎛
⎝
CNT
MSB
CNT
CNT
)
min
CNT
max
20
49
4
8
):
–
):
–
×
×
4CNT
---------------- -
MSB
4CNT
---------------- -
LSB
t
MSB
osc2
t
59
53
35
54
osc2
⎞
⎠
⎞
⎠
+
+
(
(
192
192
+
+
LSB
LSB
ST7MC1xx/ST7MC2xx
)
)
×
×
64
64
×
×
4CNT
---------------- -
MSB
4CNT
---------------- -
MSB
×
×
63/309
t
osc2
t
osc2
1