NXP Semiconductors LPC1751, Руководство пользователя, Страница: 76 / 808

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UM10360_0 © NXP B.V. 2009. All rights reserved.
User manual Rev. 00.06 — 5 June 2009 76 of 808
1. How to read this chapter
Table 8–52 shows the functions of the PINSEL registers in the LPC17xx.
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.
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: LPC17xx Pin connect block
Rev. 00.06 — 5 June 2009 User manual
Table 52. Summary of PINSEL registers
Register Controls Table
PINSEL0 P0[15:0] Table 8–57
PINSEL1 P0 [31:16] Table 8–58
PINSEL2 P1 [15:0] (Ethernet) Table 8–59
PINSEL3 P1 [31:16] Table 8–60
PINSEL4 P2 [15:0] Table 8–61
PINSEL5 P2 [31:16] not used
PINSEL6 P3 [15:0] not used
PINSEL7 P3 [31:16] Table 8–62
PINSEL8 P4 [15:0] not used
PINSEL9 P4 [31:16] Table 8–63
PINSEL10 Trace port enable Table 8–64
Table 53. Pin function select register bits
PINSEL0 to
PINSEL9 Values Function Value after Reset
00 Primary (default) function, typically GPIO port 00
01 First alternate function
10 Second alternate function
11 Third alternate function