参数资料
型号: ST72324BLK4BA/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, PLASTIC, SDIP-32
文件页数: 94/151页
文件大小: 1209K
代理商: ST72324BLK4BA/XXX
ST72F324L, ST72324BL
47/151
WATCHDOG TIMER (Cont’d)
Figure 29. 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
2ms
4
59
0
1
4ms
8
53
1
0
10ms
20
35
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
CNT
4CNT
MSB
-----------------
×
192
LSB
+
() 64
4CNT
MSB
-----------------
×
+
t
osc2
×
+
=
CNT
MSB
4
-------------
t
max
t
max0
16384
CNT
t
osc2
×
+
=
t
max
t
max0
16384
CNT
4CNT
MSB
-----------------
×
192
LSB
+
() 64
4CNT
MSB
-----------------
×
+
t
osc2
×
+
=
1
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