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 18 of 841
3.1 Introduction
The system control block includes several system features and control registers for a
number of functions that are not related to specific peripheral devices. These include:
• Reset
• Brown-Out Detection
• External Interrupt Inputs
• Miscellaneous System Controls and Status
Each type of function has its own register(s) if any are required and unneeded bits are
defined as reserved in order to allow future expansion. Unrelated functions never share
the same register addresses
3.2 Pin description
Table 6 shows pins that are associated with System Control block functions.
UM10360
Chapter 3: LPC176x/5x System control
Rev. 3 — 19 December 2013 User manual
Table 6. Pin summary
Pin name Pin
direction
Pin description
EINT0 Input External Interrupt Input 0 - An active low/high level or falling/rising
edge general purpose interrupt input. This pin may be used to wake up
the processor from Sleep, Deep-sleep, or Power-down modes.
EINT1 Input
External Interrupt Input 1 - See the EINT0 description above.
EINT2 Input
External Interrupt Input 2 - See the EINT0 description above.
EINT3 Input
External Interrupt Input 3 - See the EINT0 description above.
RESET
Input External Reset input - A LOW on this pin resets the chip, causing I/O
ports and peripherals to take on their default states, and the processor to
begin execution at address 0x0000 0000.
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