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C8051F040-GQR Datasheet(PDF) 31 Page - Silicon Laboratories |
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C8051F040-GQR Datasheet(HTML) 31 Page - Silicon Laboratories |
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31 / 328 page  C8051F040/1/2/3/4/5/6/7 Rev. 1.5 31 1.6. Controller Area Network The C8051F04x family of devices feature a Controller Area Network (CAN) controller that implements serial communication using the CAN protocol. The CAN controller facilitates communication on a CAN net- work in accordance with the Bosch specification 2.0A (basic CAN) and 2.0B (full CAN). The CAN controller consists of a CAN Core, Message RAM (separate from the C8051 RAM), a message handler state machine, and control registers. The CAN controller can operate at bit rates up to 1 Mbit/second. Silicon Labs CAN has 32 message objects each having its own identifier mask used for acceptance filtering of received messages. Incoming data, message objects and identifier masks are stored in the CAN message RAM. All protocol functions for transmission of data and acceptance filtering is performed by the CAN controller and not by the C8051 MCU. In this way, minimal CPU bandwidth is used for CAN communication. The C8051 configures the CAN controller, accesses received data, and passes data for transmission via Special Function Registers (SFR) in the C8051. Figure 1.11. CAN Controller Diagram 1.7. Serial Ports The C8051F04x MCU Family includes two Enhanced Full-Duplex UARTs, an enhanced SPI Bus, and SMBus/I2C. Each of the serial buses is fully implemented in hardware and makes extensive use of the CIP-51's interrupts, thus requiring very little intervention by the CPU. The serial buses do not "share" resources such as timers, interrupts, or Port I/O, so any or all of the serial buses may be used together with any other. Message Handler REGISTERS Message RAM (32 Message Objects) CAN Core TX RX CAN Controller CIP-51 MCU Interrupt S F R 's CANTX CANRX C8051F04x S Y S C L K CAN_CLK (fsys) BRP Prescaler |
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