Datasheet

© 2007-2012 Microchip Technology Inc. DS70292G-page 235
dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04
REGISTER 19-4: CiFCTRL: ECAN™ FIFO CONTROL REGISTER
R/W-0 R/W-0 R/W-0 U-0 U-0 U-0 U-0 U-0
DMABS<2:0>
— — — — —
bit 15 bit 8
U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — — FSA<4:0>
bit 7 bit 0
Legend: C = Writable bit, but only ‘0’ can be written to clear the bit
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 15-13 DMABS<2:0>: DMA Buffer Size bits
111 = Reserved
110 = 32 buffers in DMA RAM
101 = 24 buffers in DMA RAM
100 = 16 buffers in DMA RAM
011 = 12 buffers in DMA RAM
010 = 8 buffers in DMA RAM
001 = 6 buffers in DMA RAM
000 = 4 buffers in DMA RAM
bit 12-5 Unimplemented: Read as ‘0’
bit 4-0 FSA<4:0>: FIFO Area Starts with Buffer bits
11111 = Read buffer RB31
11110 = Read buffer RB30
•
•
•
00001 = TX/RX buffer TRB1
00000 = TX/RX buffer TRB0