SPEAR320S-2 datasheet(19/113 Pages) STMICROELECTRONICS

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SPEAr320S

Device functions

Doc ID 022508 Rev 2

19/113

2.12

Asynchronous serial ports (UART)

The SPEAr320S has 7 UART ports. The actual number of concurrently exploitable ports

depends on the selected chip operating mode. The different capabilities of each port are

summarized in Table 3 below.

Main features:

●

Programmable baud rate generator

●

Transmit FIFO queue (8-bit data, 16 entries) and receive FIFO queue (12-bit

data/status, 16 entries) with disabling option (1-byte buffer depth)

●

Supports for DMA operation

●

Hardware flow control (RTS,CTS) for some ports and configurations

●

Modem control signals (DCD, DSR, DTS, RI) for some ports and configurations

●

Fully programmable serial interface with following parameters:

–

data bits: 5, 6, 7 or 8

–

parity: even, odd, stick or none (generation and detection)

–

stop bits: 1 or 2

–

line break handling (generation and detection)

●

Flexible interrupt handing and masking

Table 3.

SPEAr320S UART capabilities

Port

Speed

Hardware flow control

Modem signals

UART0

Up to 3 Mbps

Yes

Yes (as alternate function)

UART1

Up to 7 Mbps

Yes (except for Mode 1 and 2) Yes (except for Mode 1 and 2)

UART2 - 6

Up to 7 Mbps

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