Data Sheet

Part number:WG7837-V1
Model name :WG7837-V0
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CONFIDENTIAL
HCI UART Shared Transport Layers for All Functional Blocks (Except WLAN)
The HCI UART supports most baud rates (including all PC rates) for all fast clock frequencies -
up to a maximum of 4 Mbps. After power up the baud rate is set for 115.2 kbps, regardless of fast
clock frequency. The baud rate can then be changed by using a VS command. The Device
responds with a Command Complete Event (still at 115.2 kbps), after which the baud rate change
occurs.
HCI hardware includes the following features:
 Receiver detection of break, idle, framing, FIFO overflow and parity error conditions.
 Receiver Transmitter underflow detection.
 CTS, RTS hardware flow control.
 4 wires (H4)
The below table lists the UART default settings
Table 6-3. UART Default Setting
Parameter Value
Bit Rate 115.2 kbps
Data Length 8 bits
Stop Bit 1
Parity None
UART 4-Wires Interface – H4
The interface includes four signals: TXD, RXD, CTS and RTS. Flow control between the host and
the Device is byte-wise by hardware. ( See Figure 6-5 )
Figure 6-5. HCI UART Connection
When the UART RX buffer of the device passes the flow-control threshold, the buffer sets
the UART_RTS signal high to stop transmission from the host. When the UART_CTS signal is set
high, the device stops transmitting on the interface. If HCI_CTS is set high in the middle of
transmitting a byte, the device finishes transmitting the byte and stops the transmission.