OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 270

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

15.1 How to read this chapter
15.2 Basic configuration
15.3 Features
15.4 General description
UM10441
User manual
The system tick timer (SysTick timer) is part of the ARM Cortex-M0 core and is identical
for all LPC122x parts.
The system tick timer is configured using the following registers:
The block diagram of the SysTick timer is shown below in the
The SysTick timer is an integral part of the Cortex-M0. The SysTick timer is intended to
generate a fixed 10 millisecond interrupt for use by an operating system or other system
management software.
1. Pins: The system tick timer uses no external pins.
2. Power: The system tick timer is enabled through the SysTick control register
Fig 45. System tick timer block diagram
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UM10441
Chapter 15: LPC122x System Tick (SysTick) timer
Rev. 1.1 — 10 March 2011
(Section
system clock.
Simple 24-bit timer.
Uses dedicated exception vector.
Clocked internally by the system clock.
15.5.1). The system tick timer clock is fixed to half the frequency of the
All information provided in this document is subject to legal disclaimers.
system clock
Rev. 1.1 — 10 March 2011
COUNTFLAG
clock
24-bit down counter
load
SYST_CALIB
SYST_RVR
SYST_CVR
SYST_CSR
load data
under -
flow
TICKINT
enable
count
ENABLE
System Tick
interrupt
peripheral
Figure
private
bus
45.
© NXP B.V. 2011. All rights reserved.
User manual
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