MC68340 datasheet(293/441 Pages) FREESCALE

293 / 441 page

MOTOROLA

MC68340 USER’S MANUAL

6- 43

MOVE.W

#$0742,DMAINT1(A0)

* Initialize channel status reg.

* Clear the DONE, BES, BED, CONF and BRKP bits to allow channel to startup.

MOVE.B

#$7C,DMACSR1(A0)

* Initialize function code reg.

* DMA space, supervisor data space for source and destination.

MOVE.B

#$DD,DMAFCR1(A0)

* Initialize source operand address

* Source address is equal to $6000.

MOVE.L

SARADD,DMASAR1(A0)

* Initialize destination operand address

* Destination address is equal to $8000.

MOVE.L

DARADD,DMADAR1(A0)

* Initialize the byte transfer count register

* The number of bytes to be transferred is $64 or 50 words

MOVE.L

NUMBYTE,DMABTC1(A0)

* Channel control reg. init. and Start DMA transfers

* No interrupts are enabled, destination (write) cycle.

* Source address is not incremented. Increment the destination address.

* Source size is word, destination size is word. REQ is internal.

* 100% of bus bandwidth, dual-address transfers, start the DMA transfers.

MOVE.W

#$068D,DMACCR1(A0)

***************************************************************************

END

***************************************************************************

Example 4: Cycle Steal Request Generation, Dual-Address Transfers.

***************************************************************************

* MC68340 basic DMA channel register initialization example code.

* This code is used to initialize the 68340's internal DMA channel

* registers, providing basic functions for operation.

* The code sets up channel 1 for external cycle steal request generation,

* dual-address transfers. DMA 16-bit wide data from an odd address to an

* even address. Control signals are asserted on the DMA read cycle.

***************************************************************************

* SIM40 equates

***************************************************************************

MBAR

EQU $0003FF00 Address of SIM40 Module Base Address Reg.

MODBASE

EQU $FFFFF000 SIM40 MBAR address value

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