LPC1547JBD48 datasheet(27/99 Pages) NXP

27 / 99 page

LPC15XX

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Product data sheet

Rev. 1 — 19 February 2014

27 of 99

NXP Semiconductors

LPC15xx

32-bit ARM Cortex-M3 microcontroller

• 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: Input digital filter configurable on all pins

• Digital input: Input glitch filter enabled/disabled on select pins

• Analog input

8.11 Switch Matrix (SWM)

The switch matrix controls the function of each digital or mixed analog/digital pin in a

highly flexible way by allowing to connect many functions like the USART, SPI, SCT, and

I2C functions to any pin that is not power or ground. These functions are called movable

functions and are listed in Table 4.

Functions that need specialized pads like the ADC or analog comparator inputs can be

enabled or disabled through the switch matrix. These functions are called fixed-pin

functions and cannot move to other pins. The fixed-pin functions are listed in Table 3. If a

fixed-pin function is disabled, any other movable function can be assigned to this pin.

Fig 11. Standard I/O pin 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

inverter

data output

data input

select glitch

filter

analog input

select analog input

pin configured

as digital output

driver

pin configured

as digital input

pin configured

as analog input

PROGRAMMABLE

DIGITAL FILTER

10 ns GLITCH

FILTER

aaa-010776

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