Datasheet

• Baud rate = 20 kbit/s, OVER = 1 (Oversampling 8X) => f
Nom
(min) = 1.47 MHz
•
Baud rate = 1 kbit/s, OVER = 0 (Oversampling 16X) => f
Nom
(min) = 132 kHz
• Baud rate = 1 kbit/s, OVER = 1 (Oversampling 8X) => f
Nom
(min) = 74 kHz
46.6.9.9 Identifier Parity
A protected identifier consists of two subfields: the identifier and the identifier parity. Bits 0 to 5 are assigned to the
identifier and bits 6 and 7 are assigned to the parity
.
The USART interface can generate/check these parity bits, but this feature can also be disabled. The user can
choose between two modes using US_LINMR.PARDIS:
• PARDIS = 0:
– During header transmission, the parity bits are computed and sent with the six least significant bits of
US_LINIR.IDCHR. The bits 6 and 7 of this register are discarded.
– During header reception, the parity bits of the identifier are checked. If the parity bits are wrong, an
Identifier Parity error occurs (see Parity). Only the six least significant bits of the IDCHR field are updated
with the received Identifier. The bits 6 and 7 are stuck to 0.
• PARDIS = 1:
– During header transmission, all the bits of US_LINIR.IDCHR are sent on the bus.
– During header reception, all the bits of IDCHR are updated with the received Identifier.
46.6.9.10 Node Action
Depending on the identifier, the node is affected – or not – by the LIN response. Consequently, after sending or
receiving the identifier
, the USART must be configured. There are three possible configurations:
• PUBLISH: the node sends the response.
• SUBSCRIBE: the node receives the response.
• IGNORE: the node is not concerned by the response, it does not send and does not receive the response.
This configuration is made by the field Node Action (NACT) in the US_LINMR (see USART LIN Mode Register).
Example: a LIN cluster that contains a master and two slaves:
• Data transfer from the master to the slave1 and to the slave2:
NACT(master)=PUBLISH
NACT(slave1)=SUBSCRIBE
NACT(slave2)=SUBSCRIBE
• Data transfer from the master to the slave1 only:
NACT(master)=PUBLISH
NACT(slave1)=SUBSCRIBE
NACT(slave2)=IGNORE
• Data transfer from the slave1 to the master:
NACT(master)=SUBSCRIBE
NACT(slave1)=PUBLISH
NACT(slave2)=IGNORE
• Data transfer from the slave1 to the slave2:
NACT(master)=IGNORE
NACT(slave1)=PUBLISH
NACT(slave2)=SUBSCRIBE
• Data transfer from the slave2 to the master and to the slave1:
NACT(master)=SUBSCRIBE
NACT(slave1)=SUBSCRIBE
SAM E70/S70/V70/V71 Family
Universal Synchronous Asynchronous Receiver T
ransc...
© 2019 Microchip T
echnology Inc.
Datasheet
DS60001527D-page 1211