AT32UC3C1512C Automotive Atmel Corporation, AT32UC3C1512C Automotive Datasheet - Page 511

• Manufacturer Part Number: AT32UC3C1512C Automotive
• Manufacturer: Atmel Corporation

24.7.4
Name:
Access Type:
Offset:
Reset Value:
This register, when read, returns details of the status of a transmit. Once read, individual bits may be cleared by writing a
one to them. It is not possible to write a bit to one by writing to the register.
• UND: Transmit Underrun
• COMP: Transmit Complete
• BEX:
• TGO: Transmit Go
• RLE: Retry Limit Exceeded
9166C–AVR-08/11
31
23
15
7
-
-
-
-
Buffers Exhausted Mid Frame
This bit is set when transmit DMA was not able to read data from memory, either because the bus was not granted in time or
because a used bit was read midway through frame transmission. If this occurs, the transmitter forces bad CRC.
Write a one to clear this bit.
0: No transmit underrun.
1: Transmit underrun.
This bit is set when a frame has been transmitted.
Write a one to clear this bit.
0: Transmit is not completed.
1: Transmit is completed.
This bit is set if the buffers run out during transmission of a frame. Then transmission stops, FCS shall be bad and TX_ER is
asserted.
Write a one to clear to this bit.
0: Buffer is not exhausted.
1: Buffer is exhausted.
0: Transmit is inactive.
1: Transmit is active.
This bit is set when retry limit has exceeded.
Write a one to clear this bit.
0: Retry limit is not exceeded.
Transmit Status Register
UND
30
22
14
6
-
-
-
TSR
Read/Write
0x14
0x00000000
COMP
29
21
13
5
-
-
-
BEX
28
20
12
4
-
-
-
TGO
27
19
11
3
-
-
-
RLE
26
18
10
2
-
-
-
COL
25
17
9
1
-
-
-
AT32UC3C
UBR
24
16
8
0
-
-
-
511