PXS20RM Datasheet, PDF (844/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

FlexRay Communication Controller
message buffer are given in Figure 26-143. A description of the states is given in Table 26-118. The
description tables also provide the access scheme for the access regions.
The status bits FR_MBCCSRn[EDS] and FR_MBCCSRn[LCKS] provide the application with the
required message buffer status information. The internal status information is not visible to the application.
26.6.6.4.2 Message Buffer States
This section describes the transmit message buffer states and provides a state diagram.
RESET_STATE
HDis
HL
HU
HDisLck
HE
HU
HD
HL
Idle
IS
IE
CCITx
HE
HD
HLck
Figure 26-142. Double Transmit Message Buffer State Diagram (Commit Side)
A description of the states of the commit side of a double transmit message buffer is given in Table 26-117.
Table 26-117. Double Transmit Message Buffer State Description (Commit Side)
State
FR_MBCCSR(
2n)
Access Region
Description
EDS LCKS Appl. Module
common states
HDis
0
0
CCITx
1
0
commit side specific states
Idle
1
0
HDisLck
0
1
HLck
1
1
CFG
–
– Disabled - Message Buffer under configuration.
Commit Side can not be used for internal message transfer.
ITX Internal Message Transfer - Message Buffer Data transferred
from commit side to transmit side.
–
CFG
MSG
ITX, Idle - Message Buffer Commit Side is idle.
SS Commit Side can be used for internal message transfer.
Disabled and Locked - Message Buffer under configuration.
SS Commit Side can not be used for internal message transfer.
Locked - Applications access to data, control, and status.
SS Commit Side can not be used for internal message transfer.
26-132
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor