LPC1767FBD100,551 NXP Semiconductors, LPC1767FBD100,551 Datasheet - Page 316

• Manufacturer Part Number: LPC1767FBD100,551
• Description: IC ARM CORTEX MCU 512K 100-LQFP
• Manufacturer: NXP Semiconductors
• Series: LPC17xxr

Specifications of LPC1767FBD100,551

• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: Ethernet, I²C, IrDA, Microwire, SPI, SSI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x12b, D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Processor Series: LPC17
• Core: ARM Cortex M3
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, MCB1760, MCB1760U, MCB1760UME
• For Use With: 622-1005 - USB IN-CIRCUIT PROG ARM7 LPC2K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 568-4967; 935289808551

NXP Semiconductors
Table 287: UARTn Transmit Enable Register (U0TER - address 0x4000 C030, U2TER - 0x4009 8030, U3TER -
14.5 Architecture
UM10360
User manual
Bit
6:0
7
Symbol
-
TXEN
0x4009 C030) bit description
Description
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
When this bit is 1, as it is after a Reset, data written to the THR is output on the TXD pin as
soon as any preceding data has been sent. If this bit is cleared to 0 while a character is
being sent, the transmission of that character is completed, but no further characters are
sent until this bit is set again. In other words, a 0 in this bit blocks the transfer of characters
from the THR or TX FIFO into the transmit shift register. Software implementing
software-handshaking can clear this bit when it receives an XOFF character (DC3). Software
can set this bit again when it receives an XON (DC1) character.
Table 287
The architecture of the UARTs 0, 2 and 3 are shown below in the block diagram.
The APB interface provides a communications link between the CPU or host and the
UART.
The UARTn receiver block, UnRX, monitors the serial input line, RXDn, for valid input.
The UARTn RX Shift Register (UnRSR) accepts valid characters via RXDn. After a valid
character is assembled in the UnRSR, it is passed to the UARTn RX Buffer Register FIFO
to await access by the CPU or host via the generic host interface.
The UARTn transmitter block, UnTX, accepts data written by the CPU or host and buffers
the data in the UARTn TX Holding Register FIFO (UnTHR). The UARTn TX Shift Register
(UnTSR) reads the data stored in the UnTHR and assembles the data to transmit via the
serial output pin, TXDn.
The UARTn Baud Rate Generator block, UnBRG, generates the timing enables used by
the UARTn TX block. The UnBRG clock input source is the APB clock (PCLK). The main
clock is divided down per the divisor specified in the UnDLL and UnDLM registers. This
divided down clock is the 16x oversample clock.
The interrupt interface contains registers UnIER and UnIIR. The interrupt interface
receives several one clock wide enables from the UnTX and UnRX blocks.
Status information from the UnTX and UnRX is stored in the UnLSR. Control information
for the UnTX and UnRX is stored in the UnLCR.
describes how to use TXEn bit in order to achieve software flow control.
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 August 2010
Chapter 14: LPC17xx UART0/2/3
UM10360
© NXP B.V. 2010. All rights reserved.
Reset Value
NA
1
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