K60P100M100SF2RM Datasheet, PDF (460/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Memory map/register definition
21.3.9 Clear DONE Status Bit Register (DMA_CDNE)
The CDNE provides a simple memory-mapped mechanism to clear the DONE bit in the
TCD of the given channel. The data value on a register write causes the DONE bit in the
corresponding transfer control descriptor to be cleared. Setting the CADN bit provides a
global clear function, forcing all DONE bits to be cleared. If the NOP bit is set, the
command is ignored. This allows you to write multiple-byte registers as a 32-bit word.
Reads of this register return all zeroes.
Address: DMA_CDNE is 4000_8000h base + 1Ch offset = 4000_801Ch
Bit
7
6
5
4
3
2
1
0
Read
0
0
0
Write
NOP
CADN
0
CDNE
Reset
0
0
0
0
0
0
0
0
DMA_CDNE field descriptions
Field
7
NOP
6
CADN
5–4
Reserved
3–0
CDNE
Description
0 Normal operation
1 No operation, ignore the other bits in this register
Clears All DONE Bits
0 Clears only the TCDn_CSR[DONE] bit specified in the CDNE field
1 Clears all bits in TCDn_CSR[DONE]
This field is reserved.
Clear DONE Bit
Clears the corresponding bit in TCDn_CSR[DONE]
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
460
Freescale Semiconductor, Inc.