Datasheet

429
32117D–AVR-01/12
AT32UC3C
21.7.13 Channel Control Register x
Name: CCR0, CCR1, CCR2, CCR3
Access Type: Read/Write
Offset: 0x4C, 0x5C, 0x6C, 0x7C
Reset Value: 0x000000000
• BSWP: Byte Swap
Allows swapping of the transferred bytes. See Section 21.4.2 for additional details. Assuming the word output from the zero-
extension module contains the bytes {a, b, c, d}, the following will be put into the FIFO for transmission:
• L: Last Descriptor in Chain
Used only if the channel is in Descriptor Mode.
0: The descriptor read in is not the last descriptor in the chain. The next descriptor to be read is located at the address of the
previously read descriptor + 4 words.
1: The descriptor read in is the last descriptor in the chain. The next descriptor to be read is located at the address in the
Descriptor Start Address Register (DSARx) for the channel.
• V: Descriptor Valid
Used only if the channel is in Descriptor Mode.
0: The descriptor read in is not valid.
1: The descriptor read in is valid.
• TCIE: Transfer Complete Interrupt Enable
0: Transfer Complete does not set the ISR.CHxC bit.
1: Transfer Complete sets the ISR.CHxC bit.
31 30 29 28 27 26 25 24
------ BSWP
23 22 21 20 19 18 17 16
- L V TCIE BURST SIZE
15 14 13 12 11 10 9 8
TCNT[15:8]
76543210
TCNT[7:0]
Table 21-3. Byte Swap
BSWP Byte Swap
0 {a, b, c, d}
1 {d, c, b, a}
2 {c, d, a, b}
3 {b, a, d, c}