DCAN Registers
Table 23-46. IF1CMD Register Field Descriptions (continued)
Bit
Field
Type
Reset
Description
14
DMAactive
R/WP
0h
Activation of DMA feature for subsequent internal IF1 update.
Note: Due to the auto reset feature of the DMAactive bit, this bit has
to be set for each subsequent DMA cycle separately.
0x0 = DMA request line is independent of IF1 activities.
0x1 = DMA is requested after completed transfer between IF1
register set and message RAM. The DMA request remains active
until the first read or write to one of the IF1 registers; an exception is
a write to Message Number (Bits [7:0]) when DMAactive is one.
13-8
Reserved
R
0h
7-0
Message_Number
R/WP
0h
Number of message object in message RAM which is used for data
transfer.
0x00 = Invalid message number.
0x01 = Valid message numbers (value 01 to 80).
0x80 = Valid message number.
0x81 = Invalid message numbers (value 81 to FF).
0xff = Invalid message numbers.
3961
SPRUH73H – October 2011 – Revised April 2013
Controller Area Network (CAN)
Copyright © 2011–2013, Texas Instruments Incorporated