ST92F150-EVAL STMicroelectronics, ST92F150-EVAL Datasheet - Page 427
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ST92F150-EVAL
Manufacturer Part Number
ST92F150-EVAL
Description
BOARD EVALUATION FOR ST9 SERIES
Manufacturer
STMicroelectronics
Specifications of ST92F150-EVAL
Processor To Be Evaluated
ST90158 and ST92F1x Daughter Board
Interface Type
I2C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
497-2905
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KNOWN LIMITATIONS (Cont’d)
Occurrence
The occurrence of the problem is random and pro-
portional to the baudrate. With a transmit fre-
q u e n c y o f 1 9 2 0 0 b a u d ( f C P U = 8 M H z a n d
SCIBRR=0xC9), the wrong break duration occur-
rence is around 1%.
Analysis
The LIN protocol specifies a minimum of 13 bits for
the break duration, but there is no maximum value.
Nevertheless, the maximum length of the header
is specified as (14+10+10+1)x1.4=49 bits. This is
composed of:
- the synch break field (14 bits),
- the synch field (10 bits),
- the identifier field (10 bits).
Every LIN frame starts with a break character.
Adding an idle character increases the length of
each header by 10 bits. When the problem oc-
curs, the header length is increased by 11 bits and
becomes ((14+11)+10+10+1)=45 bits.
To conclude, the problem is not always critical for
LIN communication if the software keeps the time
ST92F124/F150/F250 - KNOWN LIMITATIONS
between the sync field and the ID smaller than 4
bits, i.e. 208us at 19200 baud.
The workaround is the same as for SCI mode but
considering the low probability of occurrence (1%),
it may be better to keep the break generation se-
quence as it is.
13.8.10 LIN MASTER MODE NOT AVAILABLE
ON SCI-A
LIN Synch Breaks (13 low bits) generation is not
possible on SCI-A. LINE bit has no effect on break
length.
13.8.11 LIMITATIONS ON LQFP64 DEVICES
13.8.11.1
LQFP64 DEVICES
ADC Channels from AIN0 to AIN7 are not present
on LQFP64 devices.
13.8.11.2 EFT0 AND EFT1 NOT AVAILABLE ON
LQFP64 DEVICES
Extended Function Timers are not present on
LQFP64 devices.
AIN[7:0]
NOT
AVAILABLE
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