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BT830 Hardware Integration Guide
Version 1.3
UART Interface
This is a standard UART interface for communicating with other serial devices. The CSR8811 UART interface provides
a simple mechanism for communicating with other serial devices using the RS-232 protocol.
Figure 1: Signals that implement the UART function
The above figure shows the four signals that implement the UART function. When BT830 is connected to another
digital device, UART_RX and UART_TX transfer data between the two devices. The remaining two signals, UART_CTS
and UART_RTS, implement RS232 hardware flow control where both are active low indicators. The default
configuration of UART is 115200 bauds; None parity check; 1 stop bit; 8 bits per byte.
Note:
With a standard PC, an accelerated serial port adapter card is required to communicate with the UART at
its maximum data rate.
PCM Interface
The audio PCM interface on the BT830 supports the following:
Continuous transmission and reception of PCM encoded audio data over Bluetooth.
Processor overhead reduction through hardware support for continual transmission and reception of PCM data.
A bidirectional digital audio interface that routes directly into the baseband layer of the firmware. It does not
pass through the HCI protocol layer.
Hardware on the BT830 for sending data to and from a SCO connection.
Up to three SCO connections on the PCM interface at any one time.
PCM interface master, generating PCM_SYNC and PCM_CLK.
PCM interface slave, accepting externally generated PCM_SYNC and PCM_CLK.
Various clock formats including:
Long Frame Sync
-
Short Frame Sync
-
GCI timing environments.
13-bit or 16-bit linear, 8-bit µ-law, or A-law companded sample formats.
Receives and transmits on any selection of three of the first four slots following PCM_SYNC.
The PCM configuration options are enabled by setting PSKEY_PCM_CONFIG32.
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/bluetooth
13
Laird Technologies
Americas: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852-2923-0610
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