CC2564_15 Datasheet, PDF (16/47 Pages) Texas Instruments – Bluetooth® and Dual-Mode Controller

CC256x
SWRS121D – JULY 2012 – REVISED JANUARY 2014
www.ti.com
3.5.1.2 Transmitter
The transmitter is an all-digital, sigma-delta phase-locked loop (ADPLL) based with a digitally controlled
oscillator (DCO) at 2.4 GHz as the RF frequency clock. The transmitter directly modulates the digital PLL.
The power amplifier is also digitally controlled. The transmitter uses the polar-modulation technique. While
the phase-modulated control word is fed to the ADPLL, the amplitude-modulated controlled word is fed to
the class-E amplifier to generate a Bluetooth standard-compliant RF signal.
New features include:
• Improved TX output power
• LMS algorithm to improve the differential error vector magnitude (DEVM)
3.5.2 Host Controller Interface
The CC256x device incorporates one UART module dedicated to the HCI transport layer. The HCI
interface transports commands, events, and ACL between the device and the host using HCI data
packets.
All members of the CC256x family support the H4 protocol (4-wire UART) with hardware flow control. The
CC2560B and CC2564B devices also support the H5 protocol (3-wire UART) with software flow control.
The CC256x device automatically detects the protocol when it receives the first command.
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 (H4 protocol)
• XON and XOFF software flow control (H5 protocol)
Table 3-5 lists the UART module default settings.
Table 3-5. UART Module Default Settings
Parameter
Bit rate
Data length
Stop bit
Parity
Value
115.2 kbps
8 bits
1
None
3.5.2.1 H4 Protocol—4-Wire UART Interface
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 3-11 shows the H4 UART interface.
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Detailed Description
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