STA2416 datasheet(33/38 Pages) STMICROELECTRONICS

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STA2416

HCI UART transport layer

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HCI UART transport layer

The UART Transport Layer has been specified by the Bluetooth™ SIG, and allows HCI level

communication between a host controller (STA2416) and a host (for example, PC), via a

serial line.

The objective of this HCI UART Transport Layer is to make it possible to use the Bluetooth™

HCI over a serial interface between two UARTs on the same PCB. The HCI UART Transport

Layer assumes that the UART communication is free from line errors.

8.1

UART settings

The HCI UART Transport Layer uses the following settings for RS232:

Flow control with RTS/CTS is used to prevent temporary UART buffer overrun. It should not

be used for flow control of HCI, since HCI has its own flow control mechanisms for HCI

commands, HCI events and HCI data.

If CTS is 1, then the Host/Host Controller is allowed to send.

If CTS is 0, then the Host/Host Controller is not allowed to send.

The flow-off response time defines the maximum time from setting RTS low until the byte

flow actually stops. The signals should be connected in a null-modem fashion; i.e. the local

TXD should be connected to the remote RXD and the local RTS should be connected to the

remote CTS and vice versa.

Figure 15.

UART transport layer

Baud rate:

Configurable (Default baud rate: 57.600 kbps)

Number of data bits:

Parity bit:

no parity

Stop bit:

1 stop bit

Flow control:

RTS/CTS

Flow-off response time: 3 ms

BLUETHOOTH

HOST

BLUETHOOTH

HOST

CONTROLLER

HCI UART TRANSPORT LAYER

BLUETHOOTH HCI

D02TL556

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