LPC1837FET256,551 NXP Semiconductors, LPC1837FET256,551 Datasheet - Page 759

• Manufacturer Part Number: LPC1837FET256,551
• Description: Microcontrollers (MCU) 32BIT ARM CORTEX-M3 MCU 136KB SRAM
• Manufacturer: NXP Semiconductors
• Series: LPC18xxr

Specifications of LPC1837FET256,551

• Core: ARM Cortex M3
• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 150MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, SD/MMC, SPI, SSI, SSP, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 80
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 136K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-LBGA
• Lead Free Status / Rohs Status: Details
• Other names: 935293795551

NXP Semiconductors
Table 704: Autobaud Control Register (ACR - address 0x4008 2020) bit description
<Document ID>
User manual
Bit
0
1
2
7:3
8
9
31:10 -
Symbol
START
MODE
AUTORESTA
RT
-
ABEOINTCL
R
ABTOINTCLR
33.5.14 Auto-baud
Value Description
0
1
0
1
0
1
-
0
1
0
1
-
The UART1 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 U1DLM and U1DLL
accordingly.
Remark: the fractional rate divider is not connected during auto-baud operations, and
therefore should not be used when the auto-baud feature is needed.
Auto-baud is started by setting the U1ACR Start bit. Auto-baud can be stopped by clearing
the U1ACR 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 U1ACR
Mode bit. In mode 0 the baud-rate is measured on two subsequent falling edges of the
UART1 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 UART1 Rx pin (the length of the start bit).
The U1ACR AutoRestart bit can be used to automatically restart baud-rate measurement
if a time-out occurs (the rate measurement counter overflows). If this bit is set the rate
measurement will restart at the next falling edge of the UART1 Rx pin.
The auto-baud function can generate two interrupts.
Auto-baud start bit.
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.
Auto-baud restart bit.
No restart
Restart in case of time-out (counter restarts at next UART1 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).
Writing a 0 has no impact.
Writing a 1 will clear the corresponding interrupt in the U1IIR.
Auto-baud time-out interrupt clear bit (write-only).
Writing a 0 has no impact.
Writing a 1 will clear the corresponding interrupt in the U1IIR.
Reserved, user software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
All information provided in this document is subject to legal disclaimers.
Rev. 00.13 — 20 July 2011
Chapter 33: LPC18xx UART1
UM10430
© NXP B.V. 2011. All rights reserved.
Reset value
0
0
0
0
0
0
0
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