Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
7. Operation of LIN Interface (v2.1)
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
270
Figure 7-18 Start by Sync Field Reception during Serial Timer Stopped
(SACSR:AUTE="1", TMRE="0")
LIN Break Field
Sync Field
Timer activation
Timer stop
ＬＩＮ bus
ＳＴＭＲ
0
When the serial timer is operating and the auto baud rate adjustment bit (SACSR:AUTE) is "1", the serial
timer register (STMR) starts counting from 0 if LIN interface (v2.1) detects the first falling edge of the
Sync Field.
Figure 7-19 Start by Sync Field Reception during Serial Timer Stopped
(SACSR:AUTE="1", TMRE="1")
0
LIN Break Field
Sync Field
Timer is reset in "0".
Timer doesn't stop.
ＬＩＮ bus
ＳＴＭＲ
Note:
When the external trigger enable bit (SAGSR:TRGE) is "1" and the serial timer enable bit (SAGSR:TMRE)
is "0", the serial timer does not operate even if the edge of the external trigger set by the trigger selection bit
(SAGSR:TRG1, 0) is detected.
How to Stop Serial Timer
The serial timer will stop under the following conditions.
⋅
When the auto baud rate adjustment bit (AUTE) is "0", the serial timer will stop with resetting the serial
timer enable bit (SACSR:TMRE) to "0". The value of the serial timer register (STMR) is retained.
⋅
When the auto baud rate adjustment bit (AUTE) is "1" and the serial timer enable bit (SACSR:TMRE) is
"1", the serial timer will stop with resetting the serial timer enable bit (SACSR:TMRE) to "0" and not
during Sync Field reception. The value of the serial timer register (STMR) is retained.
⋅
When the auto baud rate adjustment bit (AUTE) is "1" and the serial timer enabled bit (SACSR:TMRE)
is "0", the serial timer is stopped and the value of the serial timer register (STMR) is maintained if LIN
interface (v2.1) detects the fifth falling edge of the Sync Field.
MB91520 Series
MN705-00010-1v0-E
1583