DA16200 datasheet(72/154 Pages) RENESAS

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DA16200

Ultra Low Power Wi-Fi SoC

Datasheet

Revision 3.6

04-Jan-2023

CFR0011-120-00

72 of 153

9.10.1

RS-232

As the serial communication between the UART and the selected device is asynchronous, additional

bits (start and stop) are inserted into the data line to indicate the beginning and end. With these bits,

two devices can be synchronized. This structure of serial data accompanied by start and stop bits is

referred to as a character, as shown in Figure 50.

Data

Start

Bit Time

Data bits

5 - 8

Parity

1- or 2-

Stop

One Character

Figure 50: Serial Data Format

An additional parity bit may be added to the serial character. This bit appears between the last data

bit and the stop bit(s) in the character structure. It provides the UART with the ability to do simple

error checking on the received data.

The UART Line Control Register is used to control the serial character characteristics. The individual

bits of the data word are sent after the start bit, starting with the least significant bit (LSB). These are

followed by the optional parity bit, followed by the stop bit(s), which can be 1 or 2.

Serial Data In

Start

Data Bit 0 (LSB)

Data Bit 1

Figure 51: Receiver Serial Data Sampling Points

All the bits in the transmission are transmitted for exactly the same time duration. This is referred to

as a Bit Period or Bit Time. One Bit Time equals 16 baud clocks. To ensure stability on the line, the

receiver samples the serial input data at approximately the mid-point of the Bit Time, once the start

bit has been detected. As the exact number of baud clocks that each bit was transmitted for is

known, calculating the mid-point for sampling is not difficult, that is every 16 baud clocks after the

mid-point sample of the start bit. Figure 49 shows the sampling points of the first couple of bits in a

serial character.

9.10.2

RS-485

DA16200 UART supports RS-485. A UART485EN register (0x054) is required to be assigned to

enable the RS-485. In order to use RS-485, an additional signal (UARTTXDOE) is required to notice

TXD intervals. This signal can be an output by selecting any of the unused GPIO pins.

Figure 52: UARTTXDOE Output Signal for UART RS-485

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