LPC81XM datasheet(54/78 Pages) NXP

54 / 78 page

LPC81XM

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Product data sheet

Rev. 4.6 — 4 April 2018

54 of 78

NXP Semiconductors

LPC81xM

32-bit ARM Cortex-M0+ microcontroller

12.8 USART interface

The maximum USART bit rate is 1.875 Mbit/s in asynchronous mode and 10 Mbit/s in

synchronous mode slave and master mode.

Remark: USART functions can be assigned to all digital pins. The characteristics are valid

for all digital pins except the open-drain pins PIO0_10 and PIO0_11.

[1]

Typical ratings are not guaranteed. The values listed are for room temperature (25

C), V

DD = 3.3 V, typical

samples.

[2]

Tcy(clk) = U_PCLK/BRGVAL. See the LPC800 User manual UM10601.

[3]

Capacitance on pin Un_SCLK CSCLK < 5 pF.

Table 19.

USART dynamic characteristics

Tamb = 40 C to 105 C; 1.8 V  VDD  3.6 V. Simulated parameters sampled at the 50 % level of

the falling or rising edge; values guaranteed by design.

Symbol

Parameter

Conditions

Min

Max

Unit

Tcy(clk)

clock cycle time

[2]

100

USART master (in synchronous mode)[3]

tsu(D)

data input set-up

time

th(D)

data input hold time

tv(Q)

data output valid time

-8

th(Q)

data output hold time

-8

USART slave (in synchronous mode)

tsu(D)

data input set-up

time

th(D)

data input hold time

tv(Q)

data output valid time CL = 10 pF

th(Q)

data output hold time CL = 10 pF

Fig 34. USART timing

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