LPC804 datasheet(71/89 Pages) NXP

71 / 89 page

LPC804

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Product data sheet

Rev. 2.1 — 25 July 2023

71 of 87

NXP Semiconductors

LPC804

32-bit Arm Cortex-M0+ microcontroller

15.4 Termination of unused pins

Table 32 shows how to terminate pins that are

not used in the application. In many cases,

unused pins may should be connected externally or configured correctly by software to

minimize the overall power consumption of the part.

Unused pins with GPIO function should be configured as outputs set to LOW with their

internal pull-up disabled. To configure a GPIO pin as output and drive it LOW, select the

GPIO function in the IOCON register, select output in the GPIO DIR register, and write a 0

to the GPIO PORT register for that pin. Disable the pull-up in the pin’s IOCON register.

In addition, it is recommended to configure all GPIO pins that are not bonded out on

smaller packages as outputs driven LOW with their internal pull-up disabled.

[1] I = Input, O = Output, IA = Inactive (no pull-up/pull-down enabled), F = floating, PU = Pull-Up.

15.5 Pin states in different power modes

[1] Default and programmed pin states are retained in sleep, deep-sleep, and power-down modes.

Table 32. Termination of unused pins

Default

state[1]

Recommended termination of unused pins

all PIOn_m

I; PU

Can be left unconnected if driven LOW and configured as GPIO output with pull-up

disabled by software.

VREFP

Tie to VDD.

Table 33. Pin states in different power modes

Active

Sleep

Deep-sleep/power-

down

Deep power-down

PIOn_m pins

As configured in the IOCON[1]. Default: internal pull-up

enabled.

Floating.

RESET

Reset function enabled. Default: input, internal pull-up

enabled.

Reset function disabled; floating; if the part

is in deep power-down mode.

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