TM4C1236H6PM Datasheet, PDF (1014/1236 Pages) Texas Instruments – Tiva Microcontroller

Controller Area Network (CAN) Module
Register 10: CAN IF1 Command Mask (CANIF1CMSK), offset 0x024
Register 11: CAN IF2 Command Mask (CANIF2CMSK), offset 0x084
Reading the Command Mask registers provides status for various functions. Writing to the Command
Mask registers specifies the transfer direction and selects which buffer registers are the source or
target of the data transfer.
Note that when a read from the message object buffer occurs when the WRNRD bit is clear and the
CLRINTPND and/or NEWDAT bits are set, the interrupt pending and/or new data flags in the message
object buffer are cleared.
CAN IFn Command Mask (CANIFnCMSK)
CAN0 base: 0x4004.0000
Offset 0x024
Type RW, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
WRNRD MASK
ARB CONTROL CLRINTPND
DATAA DATAB
Type RO
RO
RO
RO
RO
RO
RO
RO
RW
RW
RW
RW
RW
RW
RW
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:8
7
6
Name
reserved
WRNRD
MASK
Type
RO
RW
RW
Reset Description
0x0000.00 Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0
Write, Not Read
Value
0
1
Description
Transfer the data in the CAN message object specified by
the MNUM field in the CANIFnCRQ register into the CANIFn
registers.
Transfer the data in the CANIFn registers to the CAN
message object specified by the MNUM field in the CAN
Command Request (CANIFnCRQ).
Note:
Interrupt pending and new data conditions in the message
buffer can be cleared by reading from the buffer (WRNRD = 0)
when the CLRINTPND and/or NEWDAT bits are set.
0
Access Mask Bits
Value
0
1
Description
Mask bits unchanged.
Transfer IDMASK + DIR + MXTD of the message object
into the Interface registers.
1014
Texas Instruments-Production Data
June 12, 2014