OM13006,598 NXP Semiconductors, OM13006,598 Datasheet - Page 77

• Manufacturer Part Number: OM13006,598
• Description: BOARD EVAL EM773 METER EU PLUG
• Manufacturer: NXP Semiconductors
• Type: Other Power Managementr

Specifications of OM13006,598

• 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: 568-6681

NXP Semiconductors
UM10415
User manual
9.6.5 UART Interrupt Identification Register (U0IIR - 0x4004 8008, Read
Only)
U0IIR provides a status code that denotes the priority and source of a pending interrupt.
The interrupts are frozen during a U0IIR access. If an interrupt occurs during a U0IIR
access, the interrupt is recorded for the next U0IIR access.
Table 95.
Bits U0IIR[9:8] are set by the auto-baud function and signal a time-out or end of auto-baud
condition. The auto-baud interrupt conditions are cleared by setting the corresponding
Clear bits in the Auto-baud Control Register.
If the IntStatus bit is one and no interrupt is pending and the IntId bits will be zero. If the
IntStatus is 0, a non auto-baud interrupt is pending in which case the IntId bits identify the
type of interrupt and handling as described in
interrupt handler routine can determine the cause of the interrupt and how to clear the
active interrupt. The U0IIR must be read in order to clear the interrupt prior to exiting the
Interrupt Service Routine.
The UART RLS interrupt (U0IIR[3:1] = 011) is the highest priority interrupt and is set
whenever any one of four error conditions occur on the UART RX input: overrun error
(OE), parity error (PE), framing error (FE) and break interrupt (BI). The UART Rx error
condition that set the interrupt can be observed via U0LSR[4:1]. The interrupt is cleared
upon a U0LSR read.
Bit
0
3:1
5:4
7:6
8
9
31:10 -
IntId
-
Symbol
IntStatus
FIFO Enable
ABEOInt
ABTOInt
UART Interrupt Identification Register (U0IIR - address 0x4004 8008, Read Only)
bit description
All information provided in this document is subject to legal disclaimers.
Value Description
Rev. 1 — 10 September 2010
Chapter 9: EM773 Universal Asynchronous Transmitter (UART)
011
010
110
001
000
0
1
Interrupt status. Note that U0IIR[0] is active low. The
pending interrupt can be determined by evaluating
U0IIR[3:1].
At least one interrupt is pending.
No interrupt is pending.
Interrupt identification. U0IER[3:1] identifies an interrupt
corresponding to the UART Rx FIFO. All other combinations
of U0IER[3:1] not listed below are reserved (100,101,111).
1 - Receive Line Status (RLS).
2a - Receive Data Available (RDA).
2b - Character Time-out Indicator (CTI).
3 - THRE Interrupt.
4 - Modem interrupt.
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
These bits are equivalent to U0FCR[0].
End of auto-baud interrupt. True if auto-baud has finished
successfully and interrupt is enabled.
Auto-baud time-out interrupt. True if auto-baud has timed
out and interrupt is enabled.
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
Table
96. Given the status of U0IIR[3:0], an
UM10415
© NXP B.V. 2010. All rights reserved.
77 of 310
Reset
value
1
0
NA
0
0
0
NA