DA16200 datasheet(70/154 Pages) RENESAS

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DA16200

Ultra Low Power Wi-Fi SoC

Datasheet

Revision 3.6

04-Jan-2023

CFR0011-120-00

70 of 153

If the Antenna Switching Diversity function is enabled, the function is automatically done by PHY

hardware block. The basic operation scheme is as follows:

● The antenna's RSSI decision is made for 11b PPDU, except for 11g/n PPDU

● When PHY hardware detects the existence of 11b PPDU, it stores the RSSI

● After the switch to another antenna, the RSSI is stored and a decision is made about which

antenna has better RSSI

● This operation is done during 11b PPDU's preamble duration to protect corruption of 11b PPDU

data reception

● The decided antenna is not changed until there is a new 11b PPDU

11b PPDU

Preamble Header

PSDU

Antenna

Time

11g/n PPDU

11b PPDU

Preamble Header

PSDU

Example case when RSSI of Antenna 2 is higher

Figure 48: Antenna Switching Timing Diagram

For reference, this antenna switching diversity is different from MRC (Maximum Ratio Combining).

9.10 UART

DA16200 provides three UARTs, features of which are described below:

■ Programmable use of UART (UART1 and UART2)

■ Compliance to the AMBA AHB bus specification [7] for easy integration into SoC implementation

■ Supports both byte and word access for reduction of bus burden

■ Supports both RS-232 and RS-485

■ Separate 32×8 bit transmit and 32×12 bit receive FIFO memory buffers to reduce CPU interrupts

■ Programmable FIFO disabling for 1-byte depth

■ Programmable baud rate generator

■ Standard asynchronous communication bits (start, stop, and parity), which are added prior to

transmission and removed on reception

■ Independent masking of transmit FIFO, receive FIFO, and receive timeout

■ Supports for DMA

■ False start bit detection

■ Programmable flow control (CTS/RTS, UART1)

■ Fully programmable serial interface characteristics:

□ Data can be of 5, 6, 7, or 8 bits

□ Even, odd, stick, or no-parity bit generation and detection

□ 1- or 2- stop bit generation

□ Baud rate generation

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