MA180023 Microchip Technology, MA180023 Datasheet - Page 284

• Manufacturer Part Number: MA180023
• Description: MODULE PLUG-IN PIC18F46J11 PIM
• Manufacturer: Microchip Technology
• Series: PIC®r

Specifications of MA180023

• Accessory Type: Plug-In Module (PIM) - PIC18F46J11
• Tool / Board Applications: General Purpose MCU, MPU, DSP, DSC
• Mcu Supported Families: PIC18
• Supported Devices: Stand-alone Or W/ HPC(DM183022) Or PIC18(DM183032)
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18FxxJxx
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: HPC Explorer Board (DM183022) or PIC18 Explorer Board (DM183032)
• For Use With: DM183032 - BOARD EXPLORER PICDEM PIC18DM183022 - BOARD DEMO PIC18FXX22 64/80TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F46J11 FAMILY
EXAMPLE 18-2:
DS39932C-page 284
;
;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
© 2009 Microchip Technology Inc.