Enhanced Direct Memory Access (eDMA)
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor
489
15.3.1.11 DMA Set START Bit (DMASSRT) register
The DMASSRT register provides a simple memory-mapped mechanism to set the START bit in the TCD
of the given channel. The data value on a register write causes the START bit in the corresponding Transfer
Control Descriptor to be set. A data value of 64 to 127 (regardless of the number of implemented channels)
provides a global set function, forcing all START bits to be set. If bit 0 (NOP) is set, the command is
ignored. This allows multiple byte registers to be written as a 32-bit word. Reads of this register return all
zeroes. See
for the TCD START bit definition.
15.3.1.12 DMA Clear DONE Status (DMACDNE) register
The DMACDNE register 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. A data value of 64 to 127 (regardless of the number of
implemented channels) provides a global clear function, forcing all DONE bits to be cleared. If bit 0 (NOP)
is set, the command is ignored. This allows multiple byte registers to be written as a 32-bit word. Reads of
this register return all zeroes. See
for the TCD DONE bit definition.
Table 15-11. DMA Clear Error (DMACERR) field descriptions
Name
Description
NOP
No Operation
0 Normal operation.
1 No operation, ignore bits 6–0
CERR[0:6]
Clear Error Indicator
0-63 Clear corresponding bit in DMAERR{H,L}
64-127 Clear all bits in DMAERR{H,L}
Address: Base + 0x001E
Access: User write-only
0
1
2
3
4
5
6
7
R
0
0
0
0
0
0
0
0
W
NOP
SSRT
Reset
0
0
0
0
0
0
0
0
Figure 15-14. DMA Set START Bit (DMASSRT) register
Table 15-12. DMA Set START Bit (DMASSRT) field descriptions
Name
Description
NOP
No Operation
0 Normal operation.
1 No operation, ignore bits 6–0
SSRT[0:6]
Set START Bit
(Channel Service Request)
0–63 Set the corresponding channel’s TCD.start
64–127 Set all TCD.start bits
Содержание MPC5602S
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