OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 172

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

NXP Semiconductors
UM10441
User manual
a. Mode 0 (start bit and LSB are used for auto-baud)
16xbaud_rate
U0ACR start
rate counter
UARTn RX
2. A falling edge on UART RX pin triggers the beginning of the start bit. The rate
3. During the receipt of the start bit, 16 pulses are generated on the RSR baud input with
4. During the receipt of the start bit (and the character LSB for mode = 0) the rate
5. If Mode = 0 then the rate counter will stop on next falling edge of the UART RX pin. If
6. The rate counter is loaded into DLM/DLL and the baud-rate will be switched to normal
measuring counter will start counting UART_PCLK cycles optionally pre-scaled by the
fractional baud-rate generator.
the frequency of the (fractional baud-rate pre-scaled) UART input clock, guaranteeing
the start bit is stored in the RSR.
counter will continue incrementing with the pre-scaled UART input clock
(UART_PCLK).
Mode = 1 then the rate counter will stop on the next rising edge of the UART RX pin.
operation. After setting the DLM/DLL the end of auto-baud interrupt IIR ABEOInt will
be set, if enabled. The RSR will now continue receiving the remaining bits of the ”A/a"
character.
start
16 cycles
bit0
All information provided in this document is subject to legal disclaimers.
bit1
start bit
Rev. 1.1 — 10 March 2011
bit2
'A' (0x41) or 'a' (0x61)
bit3
bit4
16 cycles
bit5
bit6
LSB of 'A' or 'a'
bit7
Chapter 10: LPC122x UART1
parity stop
UM10441
© NXP B.V. 2011. All rights reserved.
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