|
PXR40PB Datasheet, PDF (14/23 Pages) Freescale Semiconductor, Inc – 32-bit Power Architecture® Microcontrollers for Real-Time Applications | |||
|
◁ |
Features
â Zero to eight bytes data length
â Programmable bit rate as fast as 1 Mb/sec
â Content-related addressing
⢠Each MB configurable as receive (Rx) or transmit (Tx), all supporting standard and extended
messages
⢠Individual Rx mask registers per message buffer
⢠Includes 1056 bytes of RAM used for message buffer storage
⢠Includes 256 bytes of RAM used for individual Rx mask registers
⢠Full featured Rx FIFO with storage capacity for six frames and internal pointer handling
⢠Powerful Rx FIFO ID filtering, capable of matching incoming IDs against either eight extended,
16 standard, or 32 partial (8 bits) IDs, with individual masking capability
⢠Selectable backwards compatibility with previous CAN version
⢠Programmable clock source to the CAN protocol interface, either bus clock or crystal oscillator
⢠Unused message buffer and Rx mask register space can be used as general-purpose RAM space
⢠Listen-only mode capability
⢠Programmable loop-back mode supporting self-test operation
⢠Programmable transmission priority scheme: lowest ID, lowest buffer number or local priority on
individual Tx message buffers.
⢠Hardware cancellation on Tx message buffers.
⢠Time stamp based on 16-bit free-running timer
⢠Global network time, synchronized by a specific message
⢠Maskable interrupts
⢠Independent of the transmission medium (an external transceiver is assumed)
⢠Short latency time due to an arbitration scheme for high-priority messages
⢠Low-power modes, with programmable wake-up on bus activity
2.5.14 Enhanced direct memory access controller (eDMA2)
The following summarizes the PXR40âs implementation of the eDMA2 controller:
⢠Second-generation modules capable of performing complex data movements via 64 programmable
channels (eDMA2-A) and 32 programmable channels (eDMA2-B), without intervention from the
host processor
⢠DMA engine
â Performs source and destination address calculations
â Performs data movement operations
⢠Includes SRAM-based memory containing the transfer control descriptors (TCD) for the channels.
⢠All data movement via dual-address transfers: read from source, write to destination
⢠Programmable source and destination addresses, transfer size, plus support for enhanced
addressing modes
PXR40 Product Brief, Rev. 1
14
PreliminaryâSubject to Change Without Notice
Freescale Semiconductor
|
▷ |