LPC804 datasheet(17/81 Pages) NXP

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LPC804

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Product data sheet

Rev. 1.3 — 23 March 2018

17 of 81

NXP Semiconductors

LPC804

32-bit Arm Cortex-M0+ microcontroller

• The switch matrix provides level shifter functionality to allow up to two selected

signals to be routed from user-selected pins in one voltage domain to selected pins in

the alternate domain. This feature can also be used on a single supply device if

voltage level shifting is not required.

Remark: The functionality of each I/O pin is flexible and is determined entirely through the

switch matrix. See Section 9.9 for details.

9.8.1 Standard I/O pad configuration

Figure 9 shows the possible pin modes for standard I/O pins with analog input function:

• Digital output driver with configurable open-drain output.

• Digital input: Weak pull-up resistor (PMOS device) enabled/disabled.

• Digital input: Weak pull-down resistor (NMOS device) enabled/disabled.

• Digital input: Repeater mode enabled/disabled.

• Digital input: Programmable input digital filter selectable on all pins.

• Analog input: Selected through the switch matrix.

Fig 9.

Standard I/O pad configuration

VDD

ESD

VSS

ESD

strong

pull-up

strong

pull-down

VDD

weak

pull-up

weak

pull-down

open-drain enable

output enable

repeater mode

enable

pull-up enable

pull-down enable

select data

transmission

gate

inverter

data output

data input

analog input

SWM PINENABLE for

analog input

pin configured

as digital output

driver

pin configured

as digital input

pin configured

as analog input

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