ST7232AK2-Auto STMicroelectronics, ST7232AK2-Auto Datasheet - Page 71

• Manufacturer Part Number: ST7232AK2-Auto
• Description: 8-bit MCU for automotive, 16 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMicroelectronics

Specifications of ST7232AK2-Auto

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators and bypass for external clock
• Four Power Saving Modes: halt, active halt, wait and slow
• Main Clock Controller With: real time base, beep and clock-out capabilities
• Two 16-bit Timers With: 2 input captures, 2 output compares, PWM and pulse generator modes

ST7232Axx-Auto
Figure 30. 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
TB1 bit (MCCSR reg.)
CNT
CNT
Value of T[5:0] bits in WDGCR register
= (LSB + 128) x 64 x t
= 16384 x t
= 125ns if f
:
<
≤
MSB
-------------
MSB
-------------
4
4
0
0
1
1
OSC2
OSC2
Then
Else
Then
Else
= 8 MHz
t
min
(Hex.)
t
t
t
max
min
max
OSC2
00
3F
=
=
=
=
t
min0
t
t
min0
t
max0
max0
TB0 bit (MCCSR reg.)
+
+
+
+
16384
16384
16384
16384
min
×
0
1
0
1
max
×
⎛
⎝
×
×
):
CNT
CNT
):
⎛
⎝
CNT
min
CNT
–
×
×
and t
–
4CNT
---------------- -
Min. watchdog timeout (ms)
t
MSB
osc2
t
4CNT
---------------- -
osc2
MSB
max
⎞
⎠
+
⎞
⎠
Selected MCCSR timebase
(
+
)
192
(
192
1.496
+
t
128
min
LSB
+
LSB
)
×
10ms
25ms
)
2ms
4ms
64
×
64
×
×
4CNT
---------------- -
MSB
4CNT
---------------- -
MSB
×
Max. watchdog timeout (ms)
×
t
osc2
t
osc2
On-chip peripherals
MSB
20
49
128.552
4
8
2.048
t
max
LSB
59
53
35
54
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