User Manual
BTM4KC
Manual
July 29, 2008 AboCom Page 8
Document#: CONFIDENTIAL Revision 0.1
3.3 RESET Sequence
RESET is asserted by module itself, the external reset circuit is not required.
3.4 UART (Universal Asynchronous Receiver Transmitter)
UART_TX, UART_RX, UART_RTS, UART_CTS form a conventional asynchronous data serial
port. The interface is designed to operate correctly when connected to other UART devices such as
the NS16550A. The signaling levels are 0V and VCC. The interface is programmable over a variety
of bit rates; none, even or odd parity; one or two stop bits and hardware flow control on or off. The
default condition on power-up is pre-assigned in the Flash memory.
The maximum UART data rate is 1.3824 Mbps. Two-way hardware flow control is implemented by
UART_RTS and UART_CTS. UART_RTS is an output and is active low. UART_CTS is an input
and is active low. These signals operate according to normal industry convention.
3.5 RESET Control
Reset mode Requirement
Description
Power On Reset Mandatory
Hardware reset. Power on reset circuit is built in Module
RESET port is not required to connecting Host for
production.
HCI reset
commands
Mandatory Software reset. Supported by AboCom Bluetooth™ Driver
3.6 PCM
3.6.1 Features
The Bluetooth module implements an audio transcoder to translate between A-law, µ-law and
linear voice data from the host and A-l a w, µ-law and CVSD voice data over the air. Voice
interpolation for lost packets is also included. PCM_OUT, PCM_IN, PCM_CLK and
PCM_SYNC carry up to three bi-directional channels of voice data, each at 8 ks/s. The PCM
samples can be 8-bit A-law, 8-bit µ-law, 13-bit linear or 16-bit linear format. The PCM_CLK and
PCM_SYNC pins can be configured as inputs or outputs, depending on whether the Bluetooth
module is the master or slave of the PCM interface.
3.6.2 Recommended Codec IC
The Bluetooth module can be interfaced directly to the following PCM audio chips:
OKI MSM7705 four channel µ/A-law codec
Motorola MC145481 8-bit µ/A-law codec
Motorola MC145483SD 13-bit linear codec
Mitel MT93LI6 Echo canceling codec