Typewriter User Manual
6- 40 MC68340 USER’S MANUAL MOTOROLA
* No interrupts are enabled, source (read) cycle. Increment source
* address, source size is long word, REQ is external burst request.
* Single-address mode, start the DMA transfers.
MOVE.W #$1823,DMACCR1(A0)
***************************************************************************
END
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Example 2: Internal Request Generation, Memory to Memory 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 internal request generation
* memory to memory transfers.
***************************************************************************
***************************************************************************
* SIM40 equates
***************************************************************************
MBAR EQU $0003FF00 Address of SIM40 Module Base Address Reg.
MODBASE EQU $FFFFF000 SIM40 MBAR address value
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* DMA Channel 1 equates
DMACH1 EQU $780 Offset from MBAR for channel 1 regs
DMAMCR1 EQU $0 MCR for channel 1
* Channel 1 register offsets from channel 1 base address
DMAINT1 EQU $4 interrupt register channel 1
DMACCR1 EQU $8 control register channel 1
DMACSR1 EQU $A status register channel 1
DMAFCR1 EQU $B function code register channel 1
DMASAR1 EQU $C source address register channel 1
DMADAR1 EQU $10 destination address register channel 1
DMABTC1 EQU $14 byte transfer count register channel 1
SARADD EQU $6000 source address
DARADD EQU $8000 destination address
NUMBYTE EQU $E number of bytes to transfer
***************************************************************************
***************************************************************************
* Initialize DMA Channel 1
***************************************************************************
LEA MODBASE+DMACH1,A0 Pointer to channel 1
* Initialize DMA channel 1 MCR
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