ST72344S4 STMicroelectronics, ST72344S4 Datasheet - Page 85

• Manufacturer Part Number: ST72344S4
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72344S4

• Up To 16 Kbytes Program Memory: single voltage extended Flash (XFlash) with readout and write protection, in-circuit and inapplication programming (ICP and IAP). 10K write/erase cycles guaranteed, data retention
• 256 Bytes Data Eeprom With Readout Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: crystal/ceramic resonator oscillators, high-accuracy internal RC oscillator or external clock
• 5 Power-saving Modes: Slow, Wait, Halt, Auto-wakeup from Halt and Active-halt
• 16-bit Timer A With: 1 input capture, 1 output compares, external clock input, PWM and pulse generator modes
• 16-bit Timer B With: 2 input captures, 2 output compares, PWM and pulse generator modes

ST72344xx ST72345xx
Figure 39. 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:
Example:
With 2 ms timeout selected in MCCSR register
min0
max0
OSC2
0
0
1
1
CNT
CNT
WDGCR Register (Hex.)
Value of T[5:0] Bits in
(MCCSR Reg.)
= (LSB + 128) x 64 x t
= 16384 x t
<
≤
= 125 ns if f
TB1 bit
MSB
-------------
MSB
-------------
4
4
3F
00
In the above formulae, division results must be rounded down to the next integer
value.
then
else
then
else
OSC2
OSC2
t
max
t
t
max
min
t
0
1
0
1
min
=
= 8 MHz
(MCCSR Reg.)
=
=
t
=
max0
t
t
min0
max0
t
OSC2
min0
TB0 bit
Doc ID 12321 Rev 5
Min. watchdog timeout (ms)
+
+
+
+
16384
16384
16384
16384
×
×
×
min
×
⎛
⎝
⎛
⎝
CNT
CNT
CNT
1.496
CNT
t
128
min
and t
2 ms
4 ms
10 ms
25 ms
–
×
–
×
4CNT
---------------- -
4CNT
---------------- -
t
MSB
MSB
max
osc2
t
Selected MCCSR
osc2
max
):
min
time base
⎞
⎠
)
⎞
⎠
+
+
):
(
(
192
192
+
+
LSB
LSB
Max. watchdog timeout (ms)
)
)
×
×
64
64
×
×
On-chip peripherals
4
8
20
49
4CNT
---------------- -
4CNT
---------------- -
MSB
MSB
128.552
2.048
MSB
t
max
×
×
t
t
osc2
osc2
59
53
35
54
LSB
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