PIC18F24J11 MICROCHIP [Microchip Technology], PIC18F24J11 Datasheet - Page 290
![no-image](/images/no-image-200.jpg)
PIC18F24J11
Manufacturer Part Number
PIC18F24J11
Description
28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F24J11.pdf
(536 pages)
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PIC18F46J11 FAMILY
EXAMPLE 19-2:
DS39932D-page 290
;
;DestBuf
;
;SrcBuf
;
PrepareTransfer:
BeginXfer:
movlw
movwf
movlw
movwf
movlw
movwf
movlw
movwf
movlw
movwf
movlw
movwf
bsf
;Execute whatever
udata
res
res
HIGH(DestBuf)
RXADDRH
LOW(DestBuf)
RXADDRL
HIGH(SrcBuf)
TXADDRH
LOW(SrcBuf)
TXADDRL
0x01
DMABCH
0xFF
DMABCL
DMACON1, DMAEN
512-BYTE SPI MASTER MODE Init AND TRANSFER (CONTINUED)
0x500
0x200
0x200
;Somewhere else in our project, lets assume we have
;allocated some RAM for use as SPI receive and
;transmit buffers.
;Let’s reserve 0x500-0x6FF for use as our SPI
;receive data buffer in this example
;Lets reserve 0x700-0x8FF for use as our SPI
;transmit data buffer in this example
;Get high byte of DestBuf address (0x05)
;Load upper four bits of the RXADDR register
;Get low byte of the DestBuf address (0x00)
;Load lower eight bits of the RXADDR register
;Get high byte of SrcBuf address (0x07)
;Load upper four bits of the TXADDR register
;Get low byte of the SrcBuf address (0x00)
;Load lower eight bits of the TXADDR register
;Lets move 0x200 (512) bytes in one DMA xfer
;Load the upper two bits of DMABC register
;Actual bytes transferred is (DMABC + 1), so
;we load 0x01FF into DMABC to xfer 0x200 bytes
;The SPI DMA module will now begin transferring
;the data taken from SrcBuf, and will store
;received bytes into DestBuf.
;CPU is now free to do whatever it wants to
;and the DMA operation will continue without
;intervention, until it completes.
;When the transfer is complete, the SSP2IF flag in
;the PIR3 register will become set, and the DMAEN bit
;is automatically cleared by the hardware.
;The DestBuf (0x500-0x7FF) will contain the received
;data.
;to reinitialize RXADDR, TXADDR, DMABC and then
;set the DMAEN bit.
To start another transfer, firmware will need
2011 Microchip Technology Inc.
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