OM13006,598 NXP Semiconductors, OM13006,598 Datasheet - Page 86

• 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
9.6.13 Auto-baud
Table 104. Auto-baud Control Register (U0ACR - address 0x4000 8020) bit description
The UART auto-baud function can be used to measure the incoming baud rate based on
the ”AT" protocol (Hayes command). If enabled the auto-baud feature will measure the bit
time of the receive data stream and set the divisor latch registers U0DLM and U0DLL
accordingly.
Auto-baud is started by setting the U0ACR Start bit. Auto-baud can be stopped by clearing
the U0ACR Start bit. The Start bit will clear once auto-baud has finished and reading the
bit will return the status of auto-baud (pending/finished).
Two auto-baud measuring modes are available which can be selected by the U0ACR
Mode bit. In Mode 0 the baud rate is measured on two subsequent falling edges of the
UART Rx pin (the falling edge of the start bit and the falling edge of the least significant
bit). In Mode 1 the baud rate is measured between the falling edge and the subsequent
rising edge of the UART Rx pin (the length of the start bit).
Bit
0
1
2
7:3
8
9
31:10 -
Symbol
Start
Mode
AutoRestart 0
-
ABEOIntClr
ABTOIntClr
All information provided in this document is subject to legal disclaimers.
Value Description
0
1
0
1
1
NA
0
1
0
1
NA
Rev. 1 — 10 September 2010
Chapter 9: EM773 Universal Asynchronous Transmitter (UART)
This bit is automatically cleared after auto-baud
completion.
Auto-baud stop (auto-baud is not running).
Auto-baud start (auto-baud is running). Auto-baud run
bit. This bit is automatically cleared after auto-baud
completion.
Auto-baud mode select bit.
Mode 0.
Mode 1.
No restart
Restart in case of time-out (counter restarts at next
UART Rx falling edge)
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
End of auto-baud interrupt clear bit (write only
accessible).
Writing a 0 has no impact.
Writing a 1 will clear the corresponding interrupt in the
U0IIR.
Auto-baud time-out interrupt clear bit (write only
accessible).
Writing a 0 has no impact.
Writing a 1 will clear the corresponding interrupt in the
U0IIR.
Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
UM10415
© NXP B.V. 2010. All rights reserved.
Reset value
0
0
0
0
0
0
0
0
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