upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 521

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Asynchronous Serial Interface (UARTA)
Sleep
bus
TXDAn (output)
INTUAnR
interrupt
Figure 16-2
About LIN
16.5.2 SBF transmission/reception format
Note
Wake-up
Note 3
8 bits
signal
frame
The UARTA has an SBF (Sync Break Field) transmission/reception control
function to enable use of the LIN function.
LIN stands for Local Interconnect Network and is a low-speed (1 to 20 kbps)
serial co
mmunication protocol intended to aid the cost reduction of an automotive
network.
LIN communication is single-master communication, and up to 15 slaves can
be connected to one master.
The LIN slaves are used to control the switches, actuators, and sensors, and
these are connected to the LIN master via the LIN network.
Normally, the LIN master is connected to a network such as CAN (Controller
Area Network).
In addition, the LIN bus uses a single-wire method and is connected to the
nodes via a transceiver that complies with ISO9141.
In the LIN protocol, the master transmits a frame with baud rate information
and the slave receives it and corrects the baud rate error. Therefore,
communication is possible when the baud rate error in the slave is ±15% or
less.
Figure 16-2 and Figure 16-3 outline the transmission and reception
manipulations of LIN.
LIN transmission manipulation outline
1.
2.
3.
Preliminary User’s Manual U17566EE1V2UM00
Note 1
SBF transmission
The interval between each field is controlled by software.
SBF output is performed by hardware. The output width is the bit length set
by the UAnOPT0.UAnSBL2 to UAnOPT0.UAnSBL0 bits. If even finer
output width adjustments are required, such adjustments can be
performed using the UAnCTLn.UAnBRS7 to UAnCTLn.UAnBRS0 bits.
80H transfer in the 8-bit mode is substituted for the wakeup signal frame.
Note 2
13 bits
Synch
break
field
Note 4
transmission
Synch
55H
field
transmission
Data
Ident
field
transmission
DATA
Data
field
transmission
DATA
Data
field
transmission
Chapter 16
Check
SUM
Data
field
521