Datasheet

LPC15XX All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
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
PIN
V
DD
V
DD
ESD
V
SS
ESD
strong
pull-up
strong
pull-down
V
DD
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