LPC804 datasheet(10/89 Pages) NXP

10 / 89 page

LPC804

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Product data sheet

Rev. 2.0 — 21 September 2021

10 of 87

NXP Semiconductors

LPC804

32-bit Arm Cortex-M0+ microcontroller

7.2 Pin description

Table 4 shows the pin functions that are fixed to specific pins on each package. These

fixed-pin functions are selectable through the switch matrix between GPIO and the

comparator, ADC, SWD, and RESET pins. By default, the GPIO function is selected

except on pins PIO0_2, PIO0_3, and PIO0_5. JTAG functions are available in boundary

scan mode only.

Movable functions for the I2C, USART, SPI, CTimer pins, Capacitive Touch, and other

peripherals can be assigned through the switch matrix to any pin that is not power or

ground in place of the pin’s fixed functions.

The following exceptions apply:

Do not assign more than one output to any pin. However, an output and/or one or more

inputs can be assigned to a pin. Once any function is assigned to a pin, the pin’s GPIO

functionality is disabled.

Eight GPIO pins trigger a wake-up from deep power-down mode. If the part must wake up

from deep power-down mode via an external pin, do not assign any movable function to

this pin. The GPIO pins should be pulled HIGH externally before entering deep

power-down mode. A LOW-going pulse as short as 50 ns causes the chip to exit deep

power-down mode and wakes up the part.

The JTAG functions TDO, TDI, TCK, TMS, and TRST are selected on pins PIO0_0 to

PIO0_4 by hardware when the part is in boundary scan mode.

PIO0_2, PIO0_3, PIO0_12, PIO0_18, and PIO0_20 are the high drive output pins.

PIO0_4, PIO0_8, PIO0_9, PIO0_10, PIO0_11, PIO0_13, PIO0_15, and PIO0_17 are the

WAKEUP pins.

LPC804 Datasheet(PDF) 10 Page - NXP Semiconductors