OM13005,598 NXP Semiconductors, OM13005,598 Datasheet - Page 281
![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
UM10415
User manual
20.5.2.7.1 Hardware and software control of interrupts
20.5.2.7 Level-sensitive and pulse interrupts
See
array, which provides the software view of the interrupt priorities.
Find the IPR number and byte offset for interrupt M as follows:
The processor supports both level-sensitive and pulse interrupts. Pulse interrupts are also
described as edge-triggered interrupts.
A level-sensitive interrupt is held asserted until the peripheral deasserts the interrupt
signal. Typically this happens because the ISR accesses the peripheral, causing it to clear
the interrupt request. A pulse interrupt is an interrupt signal sampled synchronously on the
rising edge of the processor clock. To ensure the NVIC detects the interrupt, the
peripheral must assert the interrupt signal for at least one clock cycle, during which the
NVIC detects the pulse and latches the interrupt.
When the processor enters the ISR, it automatically removes the pending state from the
interrupt, see
deasserted before the processor returns from the ISR, the interrupt becomes pending
again, and the processor must execute its ISR again. This means that the peripheral can
hold the interrupt signal asserted until it no longer needs servicing.
The Cortex-M0 latches all interrupts. A peripheral interrupt becomes pending for one of
the following reasons:
A pending interrupt remains pending until one of the following:
•
•
•
•
•
•
the corresponding IPR number, N, is given by N = N DIV 4
the byte offset of the required Priority field in this register is M MOD 4, where:
– byte offset 0 refers to register bits[7:0]
– byte offset 1 refers to register bits[15:8]
– byte offset 2 refers to register bits[23:16]
– byte offset 3 refers to register bits[31:24].
the NVIC detects that the interrupt signal is active and the corresponding interrupt is
not active
the NVIC detects a rising edge on the interrupt signal
software writes to the corresponding interrupt set-pending register bit, see
Section
The processor enters the ISR for the interrupt. This changes the state of the interrupt
from pending to active. Then:
– For a level-sensitive interrupt, when the processor returns from the ISR, the NVIC
Section 20–20.5.2.1
samples the interrupt signal. If the signal is asserted, the state of the interrupt
changes to pending, which might cause the processor to immediately re-enter the
ISR. Otherwise, the state of the interrupt changes to inactive.
20–20.5.2.4.
Section
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 10 September 2010
20.5.2.7.1. For a level-sensitive interrupt, if the signal is not
for more information about the access to the interrupt priority
Chapter 20: Appendix EM773 ARM Cortex-M0 reference
UM10415
© NXP B.V. 2010. All rights reserved.
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