CC2560A Datasheet, PDF (26/52 Pages) Texas Instruments – Dual-Mode Bluetooth Controller

CC2560A NRND; CC2564 NRND
CC2560A, CC2560B, CC2564, CC2564B
SWRS121E – JULY 2012 – REVISED JANUARY 2016
www.ti.com
Table 6-2. UART Module Default Settings (continued)
PARAMETER
Stop bit
Parity
VALUE
1
None
6.4.2.1 4-Wire UART Interface—H4 Protocol
The H4 UART Interface includes four signals:
• TX
• RX
• CTS
• RTS
Flow control between the host and the CC256x device is bytewise by hardware.
Figure 6-10 shows the H4 UART interface.
Host
Host_RX
Host_TX
Host_CTS
Host_RTS
HCI_RX
HCI_TX
HCI_CTS
HCI_RTS
Figure 6-10. H4 UART Interface
CC256x
SWRS121-003
When the UART RX buffer of the 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 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).
6.4.2.2 3-Wire UART Interface—H5 Protocol (CC2560B and CC2564B Devices)
The H5 UART interface consists of three signals (see Figure 6-11):
• TX
• RX
• GND
Host
Host_RX
Host_TX
GND
HCI_RX
HCI_TX
GND
CC256x
Figure 6-11. H5 UART Interface
SWRS121-015
The H5 protocol supports the following features:
• Software flow control (XON/XOFF)
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Detailed Description
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