UM0851 datasheet(112/245 Pages) STMICROELECTRONICS

112 / 245 page

Communication device drivers

UM0851

112/245

Doc ID 16604 Rev 2

HDLC features:

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Compliant with ISO/IEC13239

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Standard HDLC frame code/decode

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Tx channel features:

–

Automatic Inter-Frame Fill (IFF) generation (0x7E or 0xFF)

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Automatic flag generation

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Selectable CRC generation

●

Rx channel features:

–

Automatic flag detection

–

Programable address recognition

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Automatic Inter-Frame Fill (IFF) detection (0x7E or 0xFF)

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Storing CRC received into external memory is configurable

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Exception report

RS485 HDLC controller

The RS485 HDLC controller supports one signal HDLC channel at a speed up to 3.88

Mbps. It has one extra CTS signal for performing collision detection.The main features

provided by RS485 controller are listed below

General IP features:

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AMBA 2.0 compliant, AMBA slave interface for programming the controller, AMBA

master interface for transferring data between memory and IP

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DMA engine included

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Support data buffer queue

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Support interrupt queue

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Miscellaneous interrupt generation

RS485 features:

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Five interface signals: TXCLK, RXCLK, TXD, RXD, CTS

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Supports duplex Tx/Rx communication

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Maximum Tx/Rx data rate up to 3.88 Mbps

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Data sending/sampling time is configurable

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No constraints on clock duty cycle

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