CC2564_15 Datasheet, PDF (17/47 Pages) Texas Instruments – Bluetooth® and Dual-Mode Controller

CC256x
www.ti.com
SWRS121D – JULY 2012 – REVISED JANUARY 2014
Host
Host_RX
Host_TX
Host_CTS
Host_RTS
HCI_RX
HCI_TX
HCI_CTS
HCI_RTS
Figure 3-11. H4 UART Interface
CC256x
SWRS121-003
When the UART RX buffer of the CC256x device passes the flow control threshold, it sets the HCI_RTS
signal high to stop transmission from the host.
When the HCI_CTS signal is set high, the CC256x device stops transmission on the interface. If HCI_CTS
is set high while transmitting a byte, the device finishes transmitting the byte and stops the transmission.
The H4 protocol device includes a mechanism that handles the transition between active mode and sleep
mode. The protocol occurs through the CTS and RTS UART lines and is known as the enhanced HCI low
level (eHCILL) power-management protocol.
For more information on the H4 UART protocol, see Volume 4 Host Controller Interface, Part A UART
Transport Layer of the Bluetooth Core Specifications (www.bluetooth.org/en-
us/specification/adoptedspecifications).
3.5.2.2 H5 Protocol—3-Wire UART Interface (CC2560B and CC2564B Devices)
The H5 UART interface consists of three signals (see Figure 3-12):
• TX
• RX
• GND
Host
Host_RX
Host_TX
GND
HCI_RX
HCI_TX
GND
CC256x
Figure 3-12. H5 UART Interface
SWRS121-015
The H5 protocol supports the following features:
• Software flow control (XON/XOFF)
• Power management using the software messages:
– WAKEUP
– WOKEN
– SLEEP
• CRC data integrity check
For more information on the H5 UART protocol, see Volume 4 Host Controller Interface, Part D Three-
Wire UART Transport Layer of the Bluetooth Core Specifications (www.bluetooth.org/en-
us/specification/adoptedspecifications).
3.5.3 Digital Codec Interface
The codec interface is a fully programmable port to support seamless interfacing with different PCM and
I2S codec devices. The interface includes the following features:
• Two voice channels
• Master and slave modes
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