Rainbow Electronics DAB-WLS-C21 (BlueTooth) - Manual (Page 10)

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DSH_BTM402_0v9 BISM2 PA Data Sheet.DOC © 2007 EZURiO Ltd 10
The module communicates with the customer application using the following signals:
Port /TXD of the application sends data to the module’s UART_RX signal line
Port /RXD of the application receives data from the module’s UART_TX signal line
Serial Module
UART Interface
UART_TX
UART_RX
UART_CTS
UART_RTS
UART_DSR
UART_DTR
UART_RI
UART_DCD
/RXD
/TXD
/RTS
/CTS
/DTR
/DSR
/RING
/DCD
RS232 I
n
te
rfac
e
Note that the serial module output is at 3.3V CMOS logic levels. Level conversion must be added to
interface with an RS-232 level compliant interface.
6.1.2 SPI bus
The Module is a slave device that uses terminals SPI_MOSI, SPI_MISO, SPI_CLK and SPI_CSB. This
interface is used for program firmware updates at the factory.
EZURiO supply a PC based utility to allow firmware upgrade over the UART port. It is highly
recommended that customers should use this method for updating firmware.
Note: The designer should be aware that no security protection is built into the hardware or firmware
associated with this port, so the terminals should not be permanently connected in a PC application.
6.1.3 GPIO Port
Seven lines of programmable bi-directional input/outputs (I/O) are provided that can be accessed
either via the UART port, or Over The Air (OTA) from a second Bluetooth unit. These can be used as
data inputs or to control external equipment. By using these in OTA mode, a BISM module can be
used for control and data acquisition without the need for any additional host processor.
Each of the GPIO[3:9] ports can be independently configured to be either an Input or Output. A
selection of ports can be accessed synchronously.
The ports are powered from V
CC
. The mode of these lines can be configured and the lines are
accessed via S Registers 623 to 629.
Low latency I/O can be accessed by using EZURiO’s I/O via an enhanced inquiry process.
6.1.4 PCM CODEC Interface
PCM_OUT, PCM_IN, PCM_CLK and PCM_SYNC carry up to three bi-directional channels of voice data,
each at 8ksamples/s. The format of the PCM samples can be 8-bit A-law, 8-bit μ-law, 13-bit linear or
16-bit linear. The PCM_CLK and PCM_SYNC terminals can be configured as inputs or outputs,
depending on whether the module is the Master or Slave of the PCM interface. Please contact an
EZURiO FAE for further details.
The Module is compatible with the Motorola SSI TM interface and interfaces directly to PCM audio
devices including the following:
6.1.4.1 Compatible Codec Chips
• OKI 7702 single channel A-law and μ-law CODEC
Application