S912XEP100J5MAGR Freescale Semiconductor, S912XEP100J5MAGR Datasheet - Page 749
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S912XEP100J5MAGR
Manufacturer Part Number
S912XEP100J5MAGR
Description
S912XEP Series 16 Bit 50 Mhz 1 MB Flash 64 KB Ram Microcontroller - LQFP-144
Manufacturer
Freescale Semiconductor
Datasheet
1.S912XEP100J5MAG.pdf
(1328 pages)
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20.4.5.5
This module allows to check for collisions on the LIN bus.
If the bit error circuit is enabled (BERRM[1:0] = 0:1 or = 1:0]), the error detect circuit will compare the
transmitted and the received data stream at a point in time and flag any mismatch. The timing checks run
when transmitter is active (not idle). As soon as a mismatch between the transmitted data and the received
data is detected the following happens:
If the bit error detect feature is disabled, the bit error interrupt flag is cleared.
Freescale Semiconductor
Because of an order from the United States International Trade Commission, BGA-packaged product lines and partnumbers
Output Transmit
indicated here currently are not available from Freescale for import or sale in the United States prior to September 2010
•
•
•
•
•
Input Receive
Bit Error
Shift Register
Shift Register
The next bit transmitted will have a high level (TXPOL = 0) or low level (TXPOL = 1)
The transmission is aborted and the byte in transmit buffer is discarded.
the transmit data register empty and the transmission complete flag will be set
The bit error interrupt flag, BERRIF, will be set.
No further transmissions will take place until the BERRIF is cleared.
LIN Transmit Collision Detection
The RXPOL and TXPOL bit should be set the same when transmission
collision detect feature is enabled, otherwise the bit error interrupt flag may
be set incorrectly.
Receive Shift
Register
Transmit Shift
Register
Compare
Sample
Point
0
1
2
Figure 20-19. Timing Diagram Bit Error Detection
3
MC9S12XE-Family Reference Manual Rev. 1.23
Synchronizer Stage
Figure 20-18. Collision Detect Principle
4
BERRM[1:0] = 0:1
5
Bus Clock
6
7
Compare Sample Points
NOTE
8
9
RXD Pin
TXD Pin
10
11
Chapter 20 Serial Communication Interface (S12SCIV5)
BERRM[1:0] = 1:1
12
13
14
LIN Physical Interface
15
0
LIN Bus
749
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