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ST92F124 Datasheet(PDF) 326 Page - STMicroelectronics

Part # ST92F124
Description  8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E3 TM(EMULATED EEPROM), CAN 2.0B AND J1850 BLPD
PDF  429 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92F124 Datasheet(HTML) 326 Page - STMicroelectronics

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CONTROLLER AREA NETWORK (bxCAN)
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
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.
Figure 143. CAN Block Diagram
Mailbox 2
Mailbox 1
7
6
5
CAN 2.0B Active Core
Mailbox 0
Transmission
Acceptance Filters
Tx Mailboxes
Master Control
Scheduler
Master Status
Transmit Control
Transmit Status
Transmit Priority
Receive FIFO
Error Status
Error Int. Enable
Tx Error Counter
Rx Error Counter
Diagnostic
Bit Timing
Filter Mode
Filter Config.
Page Select
Interrupt Enable
Mailbox 0
1
2
Receive FIFO 1
4
3
2
1
Filter
0
Mailbox 0
1
2
Receive FIFO 0
9



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