OM13005,598 NXP Semiconductors, OM13005,598 Datasheet - Page 186
![BOARD EVAL EM773 METER US PLUG](/photos/38/74/387430/om13005_sml.jpg)
OM13005,598
Manufacturer Part Number
OM13005,598
Description
BOARD EVAL EM773 METER US PLUG
Manufacturer
NXP Semiconductors
Type
Other Power Managementr
Specifications of OM13005,598
Design Resources
Plug Meter Schematics, Gerber Files USB Dongle Schematics, Gerber Files
Main Purpose
Power Management, Energy/Power Meter
Embedded
Yes, MCU, 32-Bit
Utilized Ic / Part
EM773FHN33,551
Interface Type
USB
Maximum Operating Temperature
+ 150 C
Operating Supply Voltage
1.8 V to 3.6 V
Product
Power Management Development Tools
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Primary Attributes
-
Secondary Attributes
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
EM773, OL2381
Other names
568-6680
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NXP Semiconductors
15.7 Example timer calculations
UM10415
User manual
The following example illustrates selecting the SysTick timer reload value to obtain a
10 ms time interval with the EM773 system clock set to 48 MHz.
Example (system clock = 48MHz)
The system tick clock =
RELOAD = (system tick clock frequency × 10 ms) −1 = (24 MHz × 10 ms) −1 = 240000 −1
= 239999 = 0x0003A97F
To use the system tick timer, do the following:
1. Program the SYST_RVR register with the reload value RELOAD to obtain the desired
2. Clear the SYST_CVR register by writing to it. This ensures that the timer will count
3. Program the SYST_SCR register with the value 0x7 which enables the SysTick timer
time interval.
from the SYST_RVR value rather than an arbitrary value when the timer is enabled.
and the SysTick timer interrupt.
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 September 2010
system clock
⁄
2
= 24 MHz.
Chapter 15: EM773 System tick timer
UM10415
© NXP B.V. 2010. All rights reserved.
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