Chapter 24 LIN Controller (LINFlexD)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
531
•
4 bytes in 8-bit data format
•
2 half-words in 16-bit data format
A DMA request is triggered by FIFO not full (TX) status signals.
The concept FSM to control the DMA TX interface is shown in
. DMA TX FSM will move
to idle state if DMATXE[0] = 0.
Figure 24-52. FSM to control the DMA TX interface (UART node)
The TCD settings (typical case) are shown in
. All other TCD fields = 0. The minor loop
transfers a single byte/half-word as soon a free entry is available in the Tx FIFO.
!TFF & DMA_TEN
?
True
False
False
!TFF
?
UART TX buffer (FIFO mode)
Set TXEN
Enables DMA TX
channel request
(DMAERQH, DMAERQL)
DMA TX transfer (Req/Ack) from
RAM area to UART TX FIFO
DMA TX
(major loop) done
?
True
False
DMA TX
(minor loop) done
?
True
False
True
Содержание MPC5605BK
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