Datasheet

LPC82x All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 1 October 2014 15 of 81
NXP Semiconductors
LPC82x
32-bit ARM Cortex-M0+ microcontroller
• Digital input: Repeater mode enabled/disabled.
• Digital input: Programmable input digital filter selectable on all pins.
• Analog input: Selected through the switch matrix.
8.9 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 oscillator pins XTALIN and XTALOUT 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 7. Standard I/O pad 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
analog input
SWM PINENABLE for
analog input
pin configured
as digital output
driver
pin configured
as digital input
pin configured
as analog input
PROGRAMMABLE
DIGITAL FILTER
aaa-014392