MAC7200 datasheet(648/976 Pages) FREESCALE

Part #	MAC7200

Description	MAC7200 Microcontroller Family Reference Manual

PDF	976 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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Initialization/Application Information

MAC7200 Microcontroller Family Reference Manual, Rev. 2

570

Freescale Semiconductor

Figure 29-16. Flow-Chart of DMA Mode Master Transmit

29.7.2.2

DMA Mode, Master RX

The following flow diagram details the exact operation for using a DMA controller to receive “n” data

bytes from a slave. The first byte (the slave calling address) is always transmitted by the CPU. All

subsequent data bytes (apart from the two last data bytes) can be read by the DMA controller. The last two

data bytes must be transferred by the CPU.

Config I2C for

Master TX

CPU writes calling

address to slave

interrupt

generated

Arb Lost or

No ack ?

CPU handles

condition

yes

CPU sets

DMAENABLE

DMA writes 1

ipd_rx_req

generated

DMA written

data ?

(n-1) bytes of

yes

CPU clears

DMA enable

interrupt

generated

Start

Generated

byte of data

CPU writes last

data byte

interrupt

generated

CPU clears

MS/SL bit in CR

Stop

generated

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