UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 105 of 841
LPC176x/5x
8.1 How to read this chapter
Table 74 shows the functions of the PINSEL registers in the LPC176x/5x.
8.2 Description
The pin connect block allows most pins of the microcontroller to have more than one
potential function. Configuration registers control the multiplexers to allow connection
between the pin and the on chip peripherals.
Peripherals should be connected to the appropriate pins prior to being activated and prior
to any related interrupt(s) being enabled. Activity of any enabled peripheral function that is
not mapped to a related pin should be considered undefined.
Selection of a single function on a port pin excludes other peripheral functions available
on the same pin. However, the GPIO input stays connected and may be read by software
or used to contribute to the GPIO interrupt feature.
8.3 Pin function select register values
The PINSEL registers control the functions of device pins as shown below. Pairs of bits in
these registers correspond to specific device pins.
UM10360
Chapter 8: LPC176x/5x Pin connect block
Rev. 3 — 19 December 2013 User manual
Table 74. Summary of PINSEL registers
Register Controls Table
PINSEL0 P0[15:0] Table 79
PINSEL1 P0 [31:16] Table 80
PINSEL2 P1 [15:0] (Ethernet) Table 81
PINSEL3 P1 [31:16] Table 82
PINSEL4 P2 [15:0] Table 83
PINSEL5 P2 [31:16] not used
PINSEL6 P3 [15:0] not used
PINSEL7 P3 [31:16] Table 84
PINSEL8 P4 [15:0] not used
PINSEL9 P4 [31:16] Table 85
PINSEL10 Trace port enable Table 86
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