
FlexCAN
Freescale Semiconductor
23-3
23.1.2
Features
Following are the main features of the FlexCAN module:
•
Full implementation of the CAN protocol specification version 2.0B
— Standard data and remote frames (up to 109 bits long)
— Extended data and remote frames (up to 127 bits long)
— 0–8 bytes data length
— Programmable bit rate up to 1 Mbps
— Content-related addressing
•
Up to 16 flexible message buffers of zero to eight bytes data length, each configurable as Rx or Tx,
all supporting standard and extended messages
•
Listen-only mode capability
•
Three programmable mask registers: global (for MBs 0–13), special for MB14, and special for
MB15
•
Programmable transmission priority scheme: lowest ID or lowest buffer number
•
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)
•
Open network architecture
•
Multimaster bus
•
High immunity to EMI
•
Short latency time due to an arbitration scheme for high-priority messages
23.1.3
Modes of Operation
23.1.3.1
Normal Mode
In normal mode, the module operates receiving and/or transmitting message frames, errors are managed
normally, and all the CAN protocol functions are enabled. User and supervisor modes differ in the access
to some restricted control registers.
23.1.3.2
Freeze Mode
Freeze mode is entered by setting:
•
CANMCR[FRZ], and
•
CANMCR[HALT], or by asserting the BKPT signal.
After entry into freeze mode is requested, the FlexCAN waits until an intermission or idle condition exists
on the CAN bus, or until the FlexCAN enters the error passive or bus off state. After one of these
conditions exists, the FlexCAN waits for the completion of all internal activity such as arbitration,
matching, move-in, and move-out. When this happens, the following events occur:
MCF5329 Reference Manual, Rev 3
Summary of Contents for MCF5329
Page 106: ...ColdFire Core 3 32 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 148: ...Cache 5 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 154: ...Static RAM SRAM 6 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 184: ...Power Management 8 18 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 204: ...Reset Controller Module 10 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 220: ...System Control Module SCM 11 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 228: ...Crossbar Switch XBS 12 8 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 268: ...General Purpose I O Module 13 40 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 392: ...SDRAM Controller SDRAMC 18 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 436: ...Fast Ethernet Controller FEC 19 44 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 594: ...FlexCAN 23 30 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 678: ...Pulse Width Modulation PWM Module 26 22 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 684: ...Watchdog Timer Module 27 6 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 704: ...DMA Timers DTIM0 DTIM3 29 12 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 754: ...UART Modules 31 34 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 770: ...I2 C Interface 32 16 Freescale Semiconductor MCF5329 Reference Manual Rev 3...
Page 866: ...Debug Module 36 50 Freescale Semiconductor MCF5329 Reference Manual Rev 3...