lpc1778 NXP Semiconductors, lpc1778 Datasheet - Page 101

• Manufacturer Part Number: lpc1778
• Description: 32-bit Arm Cortex-m3 Microcontroller; Up To 512 Kb Flash And 96 Kb Sram; Usb Device/host/otg; Ethernet; Lcd; Emc
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC178x_7x
Objective data sheet
14.4 Standard I/O pin configuration
order to keep the noise coupled in via the PCB as small as possible. Also parasitics
should stay as small as possible. Values of C
accordingly to the increase in parasitics of the PCB layout.
Figure 39
The default configuration for standard I/O pins is input with pull-up enabled. The weak
MOS devices provide a drive capability equivalent to pull-up and pull-down resistors.
Fig 39. Standard I/O pin configuration with analog input
•
•
•
•
•
as digital output
as analog input
as digital input
pin configured
pin configured
pin configured
Digital output driver: Open-drain mode enabled/disabled
Digital input: Pull-up enabled/disabled
Digital input: Pull-down enabled/disabled
Digital input: Repeater mode enabled/disabled
Analog input
driver
shows the possible pin modes for standard I/O pins with analog input function:
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open-drain enable
repeater mode
output enable
analog input
data output
Rev. 00.04 — 8 July 2010
data input
enable
pull-down enable
pull-up enable
select analog input
x1
and C
32-bit ARM Cortex-M3 microcontroller
x2
should be chosen smaller
V
V
DD
DD
strong
pull-up
strong
pull-down
weak
pull-up
weak
pull-down
LPC178x/7x
© NXP B.V. 2010. All rights reserved.
V
ESD
DD
ESD
V
SS
002aaf272
101 of 112
PIN