ST72561J9-Auto STMicroelectronics, ST72561J9-Auto Datasheet - Page 320

• Manufacturer Part Number: ST72561J9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72561J9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years at 55 °C
• 5 Power Saving Modes: halt, auto wake up from halt, active halt, wait and slow

Important notes
24.2
24.2.1
320/324
Flash/FastROM devices only
LINSCI wrong break duration
SCI mode
A single break character is sent by setting and resetting the SBK bit in the SCICR2 register.
In some cases, the break character may have a longer duration than expected:
●
●
In the same way, as long as the SBK bit is set, break characters are sent to the TDO pin.
This may lead to generate one break more than expected.
Occurrence
The occurrence of the problem is random and proportional to the baud rate. With a transmit
frequency of 19200 baud (f
occurrence is around 1%.
Workaround
If this wrong duration is not compliant with the communication protocol in the application,
software can request that an Idle line be generated before the break character. In this case,
the break duration is always correct assuming the application is not doing anything between
the idle and the break. This can be ensured by temporarily disabling interrupts.
The exact sequence is:
●
●
●
●
LIN mode
If the LINE bit in the SCICR3 is set and the M bit in the SCICR1 register is reset, the LINSCI
is in LIN master mode. A single break character is sent by setting and resetting the SBK bit
in the SCICR2 register. In some cases, the break character may have a longer duration than
expected:
●
Occurrence
The occurrence of the problem is random and proportional to the baud rate. With a transmit
frequency of 19200 baud (f
occurrence is around 1%.
20 bits instead of 10 bits if M = 0
22 bits instead of 11 bits if M = 1
Disable interrupts
Reset and set TE (IDLE request)
Set and reset SBK (Break Request)
Re-enable interrupts
24 bits instead of 13 bits
CPU
CPU
Doc ID 12370 Rev 8
= 8 MHz and SCIBRR = 0xC9), the wrong break duration
= 8 MHz and SCIBRR = 0xC9), the wrong break duration
ST72561-Auto