DCAN Registers
23.4.12 TXRQ56 Register (offset = 90h) [reset = 0h]
TXRQ56 is shown in
and described in
The TXRQ12 to TXRQ78 registers hold the TxRqst bits of the implemented message objects. By reading
out these bits, the CPU can check for pending transmission requests. The TxRqst bit in a specific
message object can be set/reset by the CPU via the IF1/IF2 message interface registers, or by the
message handler after reception of a remote frame or after a successful transmission.
Figure 23-30. TXRQ56 Register
31
30
29
28
27
26
25
24
TxRqs[96:81]
R-0h
23
22
21
20
19
18
17
16
TxRqs[96:81]
R-0h
15
14
13
12
11
10
9
8
TxRqs[80:65]
R-0h
7
6
5
4
3
2
1
0
TxRqs[80:65]
R-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 23-25. TXRQ56 Register Field Descriptions
Bit
Field
Type
Reset
Description
31-16
TxRqs[96:81]
R
0h
Transmission request bits (for all message objects)
0x0 = No transmission has been requested for this message object.
0x1 = The transmission of this message object is requested and is
not yet done.
15-0
TxRqs[80:65]
R
0h
Transmission request bits (for all message objects)
0x0 = No transmission has been requested for this message object.
0x1 = The transmission of this message object is requested and is
not yet done.
3938
Controller Area Network (CAN)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated