ST72344S2 datasheet(85/247 Pages) STMICROELECTRONICS

номер детали	ST72344S2

подробное описание детали	SCI asynchronous serial interface

PDF	247 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

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85 / 247 page

ST72344xx, ST2345xx

On-chip peripherals

Doc ID 12321 Rev 6

85/247

Figure 39.

Exact timeout duration (tmin and tmax)

Where:

tmin0 = (LSB + 128) x 64 x tOSC2

tmax0 = 16384 x tOSC2

tOSC2 = 125 ns 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):

To calculate the maximum Watchdog Timeout (tmax):

Note:

In the above formulae, division results must be rounded down to the next integer

value.

Example:

With 2 ms timeout selected in MCCSR register

TB1 bit

(MCCSR Reg.)

TB0 bit

(MCCSR Reg.)

Selected MCCSR

time base

MSB

LSB

002 ms

014 ms

10 ms

25 ms

then

else

then

else

Value of T[5:0] Bits in

WDGCR Register (Hex.)

Min. watchdog timeout (ms)

tmin

Max. watchdog timeout (ms)

tmax

1.496

2.048

128

128.552

CNT

MSB

-------------

min

min0

16384

CNT

osc2

min

min0

16384

CNT

4CNT

MSB

-----------------

–

⎝⎠

⎛⎞

192

LSB

() 64

4CNT

MSB

-----------------

osc2

CNT

MSB

-------------

≤

max

max0

16384

CNT

osc2

max

max0

16384

CNT

4CNT

MSB

-----------------

–

⎝⎠

⎛⎞

192

LSB

() 64

4CNT

MSB

-----------------

osc2

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