SPEAR1340 datasheet(186/200 Pages) STMICROELECTRONICS

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Timing characteristics

SPEAr1340

186/200

Doc ID 023063 Rev 4

5.16

UART timing characteristics

tUARTCLK = 1/fUARTCLK with fUARTCLK in MHz

fBAUDRATE = the programmed baud rate frequency

For information related to baud rate generation, refer to:

●

Section 2.14: UART ports.

●

RM0078, Reference manual, SPEAr1340 architecture and functionality

Figure 47.

UART transmit and receive waveform

Note:

The above min. and max. values allow a deviation of

±1 baud cycle in a single bit time. The

accumulated deviation of a UART character frame must not exceed 3/(16*fbaudrate).

Table 101.

UART transmit timing characteristics

Symbol

Parameters

Min

Max

Unit

tBIT

UART duration of transmit data bit (B0..B7),

Parity bit (Pbit), Start bit, Stop bits

1/fbaudrate -

tUARTCLK -1

1/fbaudrate +

tUARTCLK +1

Table 102.

UART receive timing characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

tBIT

Pulse duration of receive data bit

(B0 ..B7), Parity bit (Pbit), Start

bit, Stop bits(1)

The time margin is with respect to a single bit accumulation and not with respect to the whole UART frame.

The start bit is sampled after the 8th baud cycle after a low is detected at input, Subsequently, each bit is

sampled at consecutive 16 baud cycles.

Baudrate = 6

Mbps

1/fbaudrate -

(tUARTCLK/2)

1/fbaudrate +

(tUARTCLK/2)

1/fbaudrate -1/

(16*fbaudrate)

1/fbaudrate +

(16*fbaudrate)

Start bit

UARTTXD

UARTRXD

Stop Bit

B2-- - B7

Pbit

tBIT

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