CC2564MODN Datasheet, PDF (19/62 Pages) Texas Instruments – Bluetooth Host Controller Interface (HCI) Module

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5.6 Bluetooth Transport Layers
Figure 5-3 shows the Bluetooth transport layers.
UART transport layer
CC2564MODN, CC2564MODA
SWRS160D – FEBRUARY 2014 – REVISED DECEMBER 2015
Host controller interface
Data
Control
Event
HCI data handler
HCI command handler
Data
Link manager
Data
Link controller
General
modules:
HCI vendor-
specific
Trace
Timers
Sleep
RF
Figure 5-3. Bluetooth Transport Layers
SWRS121-016
5.7 Host Controller Interface
The TI Bluetooth HCI module incorporates one UART module dedicated to the HCI transport layer. The
HCI interface transports commands, events, ACL between the device and the host using HCI data
packets.
The maximum baud rate of the UART module is 4 Mbps; however, the default baud rate after power up is
set to 115.2 kbps. The baud rate can thereafter be changed with a VS command. The device responds
with a command complete event (still at 115.2 kbps), after which the baud rate change occurs.
The UART module includes the following features:
• Receiver detection of break, idle, framing, FIFO overflow, and parity error conditions
• Transmitter underflow detection
• CTS and RTS hardware flow control (UART Transport Layer)
• XON and XOFF software flow control (Three-wire UART Transport Layer)
Table 5-2 lists the UART module default settings.
Table 5-2. UART Module Default Settings
PARAMETER
Bit rate
Data length
Stop bit
Parity
VALUE
115.2 kbps
8 bits
1
None
5.7.1 UART Transport Layer
The UART Transport Layer includes four signals:
• TX
• RX
• CTS
• RTS
Flow control between the host and the TI Bluetooth HCI module is bytewise by hardware.
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