PXN20RM Datasheet, PDF (627/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

FlexRay Communication Controller (FlexRAY)
Condition
Any Time
Disabled Mode
Normal Mode
POC:config
MB_DIS
MB_LCK
Table 26-6. Register Write Access Restrictions
Indication
—
MCR[MEN] = 0
MCR[MEN] = 1
PSR0[PROTSTATE] = POC:config
MBCCSRn[EDS] = 0
MBCCSRn[LCKS] = 1
Description
No write access restriction.
Write access only when the controller is in Disabled Mode.
Write access only when the controller is in Normal Mode.
Write access only when the Protocol is in the POC:config state.
Write access only when the related Message Buffer is disabled.
Write access only when the related Message Buffer is locked.
26.5.2.2.2 Register Write Access Requirements
All registers can be accessed with 8-bit, 16-bit and 32-bit wide operations. For some of the registers, at
least a 16-bit wide write access is required to ensure correct operation. This write access requirement is
stated in the detailed register description for each register affected
26.5.2.2.3 Internal Register Access
The following memory mapped registers are used to access multiple internal registers.
• Strobe Signal Control Register (STBSCR)
• Slot Status Selection Register (SSSR)
• Slot Status Counter Condition Register (SSCCR)
• Receive Shadow Buffer Index Register (RSBIR)
Each of these memory mapped registers provides a SEL field and a WMD bit. The SEL field is used to
select the internal register. The WMD bit controls the write mode. If the WMD bit is set to 0 during the
write access, all fields of the internal register are updated. If the WMD bit set to 1, only the SEL field is
changed. All other fields of the internal register remain unchanged. This allows for reading back the values
of the selected internal register in a subsequent read access.
26.5.2.3 Module Version Register (MVR)
Base + 0x0000
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
CHIVER
PEVER
W
Reset 1
0
0
1
1
1
0
1
0
1
1
0
0
1
1
0
Figure 26-2. Module Version Register (MVR)
This register provides the controller version number. The module version number is derived from the CHI
version number and the PE version number.
Table 26-7. MVR Field Descriptions
Field
CHIVER
PEVER
Description
CHI Version Number—This field provides the version number of the controller host interface.
PE Version Number—This field provides the version number of the protocol engine.
Freescale Semiconductor
PXN20 Microcontroller Reference Manual, Rev. 1
26-13