6.15.3 UART 4-Wire Interface

UART is the main host interface for BLE, which supports the host controller interface (HCI) transport layer.

6.15.3.1 UART Timing Parameters

Figure 6-6. UART Timing Diagram

PARAMETER

TEST CONDITIONS

SYMBOL

MIN

TYP

MAX

UNIT

Baud rate

37.5

4364

Kbps

Baud rate accuracy per byte

Receive/Transmit

–2.5

1.5

%

Baud rate accuracy per bit

Receive/Transmit

–12.5

12.5

%

CTS low to TX_DATA on

t3

0

2

μs

CTS high to TX_DATA off

Hardware flow control

t4

1

Byte

CTS High Pulse Width

t6

1

bit

RTS low to RX_DATA on

t1

0

2

μs

RTS high to RX_DATA off

Interrupt set to 1/4 FIFO

t2

16

Bytes

STR

-

Start bit

D0..Dn -

Data bits (LSB first)

PAR

-

Parity bit (if used)

STP

-

Stop bit

TX

STR

D0

D1

D2

Dn

PAR

STP

tb

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