CC256X_13 Datasheet, PDF (19/51 Pages) Texas Instruments – Bluetooth and Dual-Mode Controller

CC256x
www.ti.com
SWRS121C – JULY 2012 – REVISED OCTOBER 2013
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 UART_RTS
signal high to stop transmission from the host.
When the UART_CTS signal is set high, the CC256x device stops its transmission on the interface. If
HCI_CTS is set high while transmitting a byte, the CC256x 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
Figure 3-12. H5 UART Interface
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).
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