LPC1857FET256,551 NXP Semiconductors, LPC1857FET256,551 Datasheet - Page 757
LPC1857FET256,551
Manufacturer Part Number
LPC1857FET256,551
Description
IC MCU 32BIT 1MB FLASH 256LBGA
Manufacturer
NXP Semiconductors
Series
LPC18xxr
Datasheets
1.LPC1830FET256551.pdf
(87 pages)
2.LPC1810FET100551.pdf
(2 pages)
3.LPC1810FET100551.pdf
(1164 pages)
Specifications of LPC1857FET256,551
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, LCD, 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
Lead free / RoHS Compliant
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Table 701: UART1 Line Status Register (LSR - address 0x4008 2014) bit description
<Document ID>
User manual
Bit
3
4
5
6
7
31:8
Symbol
TEMT
-
FE
BI
THRE
RXFE
33.5.11 UART1 Modem Status Register
The U1MSR is a read-only register that provides status information on the modem input
signals. U1MSR[3:0] is cleared on U1MSR read. Note that modem signals have no direct
effect on UART1 operation, they facilitate software implementation of modem signal
operations.
Value Description
0
1
0
1
0
1
0
1
0
1
Framing Error.
When the stop bit of a received character is a logic 0, a framing error occurs. An
U1LSR read clears U1LSR[3]. The time of the framing error detection is
dependent on U1FCR0. Upon detection of a framing error, the RX will attempt to
resynchronize to the data and assume that the bad stop bit is actually an early
start bit. However, it cannot be assumed that the next received byte will be correct
even if there is no Framing Error.
Note: A framing error is associated with the character at the top of the UART1
RBR FIFO.
Framing error status is inactive.
Framing error status is active.
Break Interrupt.
When RXD1 is held in the spacing state (all zeroes) for one full character
transmission (start, data, parity, stop), a break interrupt occurs. Once the break
condition has been detected, the receiver goes idle until RXD1 goes to marking
state (all ones). An U1LSR read clears this status bit. The time of break detection
is dependent on U1FCR[0].
Note: The break interrupt is associated with the character at the top of the UART1
RBR FIFO.
Break interrupt status is inactive.
Break interrupt status is active.
Transmitter Holding Register Empty.
THRE is set immediately upon detection of an empty UART1 THR and is cleared
on a U1THR write.
U1THR contains valid data.
U1THR is empty.
Transmitter Empty.
TEMT is set when both U1THR and U1TSR are empty; TEMT is cleared when
either the U1TSR or the U1THR contain valid data.
U1THR and/or the U1TSR contains valid data.
U1THR and the U1TSR are empty.
Error in RX FIFO.
U1LSR[7] is set when a character with a RX error such as framing error, parity
error or break interrupt, is loaded into the U1RBR. This bit is cleared when the
U1LSR register is read and there are no subsequent errors in the UART1 FIFO.
U1RBR contains no UART1 RX errors or U1FCR[0]=0.
UART1 RBR contains at least one UART1 RX error.
Reserved, 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.
757 of 1164
Reset
value
0
0
1
1
0
NA
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