st92f124 STMicroelectronics, st92f124 Datasheet - Page 325

• Manufacturer Part Number: st92f124
• Description: 8/16-bit Single Voltage Flash Mcu Family With Ram, E3 Tmemulated Eeprom, Can 2.0b And J1850 Blpd
• Manufacturer: STMicroelectronics

CONTROLLER AREA NETWORK (Cont’d)
CAN 2.0B Active Core
The bxCAN module handles the transmission and
the reception of CAN messages fully autonomous-
ly. Standard identifiers (11-bit) and extended iden-
tifiers (29-bit) are fully supported by hardware.
Control, Status and Configuration Registers
The application uses these registers to:
– Configure CAN parameters, e.g.baud rate
– Request transmissions
– Handle receptions
– Manage interrupts
– Get diagnostic information
Figure 143. CAN Block Diagram
Master Control
Interrupt Enable
Master Status
Transmit Control
Transmit Status
Transmit Priority
Receive FIFO
Page Select
Error Status
Error Int. Enable
Tx Error Counter
Rx Error Counter
Diagnostic
Bit Timing
Filter Mode
Filter Config.
Tx Mailboxes
Transmission
Mailbox 0
Mailbox 1
Scheduler
Mailbox 2
Filter
CAN 2.0B Active Core
CONTROLLER AREA NETWORK (bxCAN)
Tx Mailboxes
Three transmit mailboxes are provided to the soft-
ware for setting up messages. The transmission
Scheduler decides which mailbox has to be trans-
mitted first.
Acceptance Filters
The bxCAN provides eight scalable/configurable
identifier filter banks for selecting the incoming
messages the software needs and discarding the
others.
Receive FIFO
Two receive FIFOs are used by hardware to store
the incoming messages. Three complete messag-
es can be stored in each FIFO. The FIFOs are
managed completely by hardware.
Receive FIFO 0
Mailbox 0
0
Acceptance Filters
1
1
2
2
3
Receive FIFO 1
Mailbox 0
4
5
6
1
325/426
2
7
9