EKTF6708 datasheet(122/158 Pages) EMC

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eKTF6708

8-Bit Microcontroller

112



IC Product Specification (V1.2) 03.12.2020

(This specification is subject to change without prior notice)

The figure below shows the general format of one character sent or received. The

communication channel is normally held in the marked state (high). Character

transmission or reception starts with a transition to the space state (low).

The first bit transmitted or received is the start bit (low). It is followed by the data bits, in

which the least significant bit (LSB) comes first. The data bits are followed by the parity bit.

If present, the stop bit or bits (high) confirm the end of the frame.

In receiving, the UART synchronizes on a falling edge of the start bit. When two or three

“0”s are detected during three samples, it is recognized as normal start bit and the

receiving operation is started.

Parity

bit

Start

Bit

Stop

Bit

Idle state

(mark)

1 bit

7 or 8 bits

One character of frame

Figure 6-17 Data Format in UART

6.11.1 UART Mode

There are three UART modes. Mode 1 (7 bits data) and Mode 2 (8 bits data) allow the

addition of a parity bit. The parity bit addition is not available in Mode 3. Figure 6-18a

below shows the data format in each mode.

UMODE

PRE

7 bits data

Parity

8 bits data

Parity

Start

Stop

9 bits data

Start

Stop

Mode 1

Mode 2

Mode 3

Figure 6-18a UART Model

EKTF6708 Datasheet(PDF) 122 Page - ELAN Microelectronics Corp

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