STA8089GAT datasheet(17/33 Pages) STMICROELECTRONICS

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DS11777 Rev 4

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STA8089GAT

General description

3.4

APB peripherals

3.4.1

CAN

The 2 CAN cores perform communication according to the CAN protocol version 2.0 part A

and B. The bit rate can be programmed to values up to 1 MBit/s. For the connection to the

physical layer, additional transceiver hardware is required.

CAN consists of the CAN core, message RAM, message handler, control registers and

module. For communication on a CAN network, individual message objects are configured.

The message objects and identifier masks for acceptance filtering of received messages are

stored in the message RAM. All functions concerning the handling of messages are

implemented in the message handler. These functions include acceptance filtering, the

transfer of messages between the CAN core and the message RAM, and the handling of

transmission requests as well as the generation of the module interrupt.

The register set of the CAN can be accessed directly by the CPU through the module

interface. These registers are used to control/configure the CAN core and the message

handler and to access the message RAM.

CAN features



Supports CAN protocol version 2.0 part A and B



32 messages objects



Each message object has its own identifier mask



Maskable interrupt



Disabled automatic re-transmission mode for time triggered CAN applications



Programmable loop-back mode for self-test operation



Two 16-bit module interfaces to the AMBA APB bus from ARM

3.4.2

UART

The UARTx (x = 1|2) performs serial-to-parallel conversion on data asynchronously

received from a peripheral device on UARTx_RX pin, and parallel-to-serial conversion on

data written by CPU for transmission on UARTx_TX pin. The transmit and receive paths are

buffered with internal FIFO memories allowing up to 64 data byte for transmission, and 64

data byte with 4-bit status (break, frame, parity, and overrun) for receive.

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