SCIMX6DP4AVT2AB datasheet(134/168 Pages) NXP

134 / 168 page

i.MX 6DualPlus/6QuadPlus Applications Processors Consumer Products, Rev. 3, 11/2018

134

NXP Semiconductors

Electrical Characteristics

4.12.21.2 UART RS-232 Serial Mode Timing

The following sections describe the electrical information of the UART module in the RS-232 mode.

4.12.21.2.1 UART Transmitter

Figure 94 depicts the transmit timing of UART in the RS-232 serial mode, with 8 data bit/1 stop bit

format. Table 87 lists the UART RS-232 serial mode transmit timing characteristics.

Figure 94. UART RS-232 Serial Mode Transmit Timing Diagram

4.12.21.2.2

UART Receiver

Figure 95 depicts the RS-232 serial mode receive timing with 8 data bit/1 stop bit format. Table 88 lists

serial mode receive timing characteristics.

Figure 95. UART RS-232 Serial Mode Receive Timing Diagram

Table 87. RS-232 Serial Mode Transmit Timing Parameters

Parameter

Symbol

Min

Max

Unit

UA1

Transmit Bit Time

tTbit

1/Fbaud_rate

1 – T

ref_clk

1 F

baud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency)/16.

2 T

ref_clk: The period of UART reference clock ref_clk (ipg_perclk after RFDIV divider).

1/Fbaud_rate + Tref_clk

—

Table 88. RS-232 Serial Mode Receive Timing Parameters

Parameter

Symbol

Min

Max

Unit

UA2

Receive Bit Time1

1 The UART receiver can tolerate 1/(16 × Fbaud_rate) tolerance in each bit. But accumulation tolerance in one frame must not

exceed 3/(16

× Fbaud_rate).

tRbit

1/Fbaud_rate

2 –

1/(16

× Fbaud_rate)

2 F

baud_rate: Baud rate frequency. The maximum baud rate the UART can support is (ipg_perclk frequency)/16.

1/Fbaud_rate +

1/(16

× Fbaud_rate)

—

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

UARTx_TX_DATA

(output)

Bit 3

Start

Bit

STOP

BIT

START

BIT

POSSIBLE

PARITY

BIT

Par Bit

UA1

Bit 1

Bit 2

Bit 0

Bit 4

Bit 5

Bit 6

Bit 7

UARTx_RX_DATA

(input)

Bit 3

Start

Bit

STOP

BIT

START

BIT

POSSIBLE

PARITY

BIT

Par Bit

UA2

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