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Enhanced Direct Memory Access (eDMA)
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
9-31
252
0x1C
[28]
D_REQ
Disable hardware request. If this flag is set, the eDMA hardware automatically clears the
corresponding EDMA_ERQH or EDMA_ERQL bit when the current major iteration count
reaches zero.
0 The channel’s EDMA_ERQH or EDMA_ERQL bit is not affected.
1 The channel’s EDMA_ERQH or EDMA_ERQL bit is cleared when the outer major loop
is complete.
253
0x1C
[29]
INT_HALF
Enable an interrupt when major counter is half complete.
If this flag is set, the channel generates an interrupt request by setting the bit in the
EDMA_ERQH or EDMA_ERQL when the current major iteration count reaches the
halfway point. The eDMA engine performs the compare (CITER == (BITER >> 1)). This
halfway point interrupt request supports double-buffered (aka ping-pong) schemes, or
where the processor needs an early indication of the data transfer’s progress during data
movement. CITER = BITER = 1 with INT_HALF enabled generates an interrupt as it
satisfies the equation (CITER == (BITER >> 1)) after a single activation.
0 The half-point interrupt is disabled.
1 The half-point interrupt is enabled.
254
0x1C
[30]
INT_MAJ
Enable an interrupt when major iteration count completes. If this flag is set, the channel
generates an interrupt request by setting the appropriate bit in the EDMA_ERQH or
EDMA_ERQL when the current major iteration count reaches zero.
0 The end-of-major loop interrupt is disabled.
1 The end-of-major loop interrupt is enabled.
255
0x1C
[31]
START
Channel start. If this flag is set, the channel is requesting service. The eDMA hardware
automatically clears this flag after the channel begins execution.
0 The channel is not explicitly started.
1 The channel is explicitly started via a software initiated service request.
Table 9-19. TCD
n
Field Descriptions (continued)
Bits
Word Offset
[n:n]
Field Name
Description
Содержание MPC5566
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