Operations In Synchronous Mode (Operating Mode 2) - Fujitsu 8FX Hardware Manual

MB95630H Series
14.6.2 Operations in Synchronous Mode
(Operating Mode 2)
When the LIN-UART is used in operating mode 2 (normal mode), the transfer
method is clock synchronous transfer.

■ Operations in Synchronous Mode (Operating Mode 2)

● Transmit/receive data format
In synchronous mode, 8-bit data is transmitted and received; the addition of the start bit and of
the stop bit can be selected (ECCR:SSM). When the start/stop bits are added to the data format
(ECCR:SSM = 1), the addition of the parity bit can also be selected (SCR:PEN).
Figure 14.6-3 shows the data format in synchronous mode (operating mode 2).
Figure 14.6-3 Transmit/Receive Data Format (Operating Mode 2)
Transmit/receive data
(ECCR:SSM=0,SCR:PEN=0)
Transmit/receive data
(ECCR:SSM=1,SCR:PEN=0)
Transmit/receive data
(ECCR:SSM=1,SCR:PEN=1)
*: When two stop bits are used (SCR:SBL = 1)
ST: Start bit, SP: Stop bit, P: Parity bit Data bit transfer method: LSB-first
● Clock inversion function
When the SCES bit in the LIN-UART extended status control register (ESCR) is "1", the serial
clock is inverted. In the case of serial clock reception side is selected, the LIN-UART samples
data at the falling edge of the received serial clock. In the case of serial clock transmission side
is selected, the mark level is set to "0" when the SCES bit is "1".
Figure 14.6-4 Transmission Data Format During Clock Inverted
Transmit/receive clock
(SCES = 0, CCO = 0)
Transmit/receive clock
(SCES = 1, CCO = 0)
Data stream (SSM = 1)
(No parity, 1 stop bit)
● Start/stop bits
When the SSM bit in the LIN-UART extended communication control register (ECCR) is "1",
the start and stop bits are added to the data format as they are in asynchronous mode.
MN702-00009-2v0-E
D0 D1 D2 D3 D4 D5 D6 D7
ST D0 D1 D2 D3 D4 D5 D6 D7
ST D0 D1 D2 D3 D4 D5 D6 D7
ST
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER 14 LIN-UART
14.6 Operations of LIN-UART and LIN-UART
Setting Procedure Example
SP
Data frame
*
SP SP
*
P SP SP
Mark level
Mark level
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