Datasheet

 2009-2012 Microchip Technology Inc. DS70593D-page 137
dsPIC33FJXXXGPX06A/X08A/X10A
REGISTER 8-1: DMAxCON: DMA CHANNEL x CONTROL REGISTER
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 U-0 U-0 U-0
CHEN SIZE DIR HALF NULLW
— — —
bit 15 bit 8
U-0 U-0 R/W-0 R/W-0 U-0 U-0 R/W-0 R/W-0
— —AMODE<1:0>— —MODE<1:0>
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15 CHEN: Channel Enable bit
1 = Channel enabled
0 = Channel disabled
bit 14 SIZE: Data Transfer Size bit
1 = Byte
0 = Word
bit 13 DIR: Transfer Direction bit (source/destination bus select)
1 = Read from DMA RAM address, write to peripheral address
0 = Read from peripheral address, write to DMA RAM address
bit 12 HALF: Early Block Transfer Complete Interrupt Select bit
1 = Initiate block transfer complete interrupt when half of the data has been moved
0 = Initiate block transfer complete interrupt when all of the data has been moved
bit 11 NULLW: Null Data Peripheral Write Mode Select bit
1 = Null data write to peripheral in addition to DMA RAM write (DIR bit must also be clear)
0 = Normal operation
bit 10-6 Unimplemented: Read as ‘0’
bit 5-4 AMODE<1:0>: DMA Channel Operating Mode Select bits
11 = Reserved
10 = Peripheral Indirect Addressing mode
01 = Register Indirect without Post-Increment mode
00 = Register Indirect with Post-Increment mode
bit 3-2 Unimplemented: Read as ‘0’
bit 1-0 MODE<1:0>: DMA Channel Operating Mode Select bits
11 = One-Shot, Ping-Pong modes enabled (one block transfer from/to each DMA RAM buffer)
10 = Continuous, Ping-Pong modes enabled
01 = One-Shot, Ping-Pong modes disabled
00 = Continuous, Ping-Pong modes disabled