LPC2458FET180,551 NXP Semiconductors, LPC2458FET180,551 Datasheet - Page 447

• Manufacturer Part Number: LPC2458FET180,551
• Description: IC ARM7 MCU FLASH 512K 180TFBGA
• Manufacturer: NXP Semiconductors
• Series: LPC2400r

Specifications of LPC2458FET180,551

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 72MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, MMC, SPI, SSI, SSP, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
• Number Of I /o: 136
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 98K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 180-TFBGA
• Processor Series: LPC24
• Core: ARM7TDMI-S
• Data Bus Width: 32 bit
• Data Ram Size: 98 KB
• Interface Type: CAN, Ethernet, I2C, I2S, IrDA, SPI, SSP, UART, USB
• Maximum Clock Frequency: 72 MHz
• Number Of Programmable I/os: 136
• Number Of Timers: 4
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, SAB-TFBGA180
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 1 Channel
• Package: 180TFBGA
• Device Core: ARM7TDMI-S
• Family Name: LPC2000
• Maximum Speed: 72 MHz
• For Use With: 622-1023 - BOARD SCKT ADAPTER FOR TFBGA180622-1005 - 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: 568-4258; 935282454551; LPC2458FET180-S

NXP Semiconductors
UM10237_4
User manual
4.1 UART1 Receiver Buffer Register (U1RBR - 0xE001 0000, when
4.2 UART1 Transmitter Holding Register (U1THR - 0xE001 0000 when
4.3 UART1 Divisor Latch LSB and MSB Registers (U1DLL - 0xE001 0000
DLAB = 0 Read Only)
The U1RBR is the top byte of the UART1 RX FIFO. The top byte of the RX FIFO contains
the oldest character received and can be read via the bus interface. The LSB (bit 0)
represents the “oldest” received data bit. If the character received is less than 8 bits, the
unused MSBs are padded with zeroes.
The Divisor Latch Access Bit (DLAB) in U1LCR must be zero in order to access the
U1RBR. The U1RBR is always Read Only.
Since PE, FE and BI bits correspond to the byte sitting on the top of the RBR FIFO (i.e.
the one that will be read in the next read from the RBR), the right approach for fetching the
valid pair of received byte and its status bits is first to read the content of the U1LSR
register, and then to read a byte from the U1RBR.
Table 397. UART1 Receiver Buffer Register (U1RBR - address 0xE001 0000 when DLAB = 0,
DLAB = 0, Write Only)
The U1THR is the top byte of the UART1 TX FIFO. The top byte is the newest character in
the TX FIFO and can be written via the bus interface. The LSB represents the first bit to
transmit.
The Divisor Latch Access Bit (DLAB) in U1LCR must be zero in order to access the
U1THR. The U1THR is always Write Only.
Table 398. UART1 Transmitter Holding Register (U1THR - address 0xE001 0000 when
and U1DLM - 0xE001 0004, when DLAB = 1)
The UART1 Divisor Latch is part of the UART1 Baud Rate Generator and holds the value
used to divide the APB clock (PCLK) in order to produce the baud rate clock, which must
be 16x the desired baud rate
form a 16 bit divisor where U1DLL contains the lower 8 bits of the divisor and U1DLM
contains the higher 8 bits of the divisor. A 0x0000 value is treated like a 0x0001 value as
division by zero is not allowed.The Divisor Latch Access Bit (DLAB) in U1LCR must be
one in order to access the UART1 Divisor Latches. Details on how to select the right value
for U1DLL and U1DLM can be found later on in this chapter.
Bit
7:0
Bit
7:0
Symbol
RBR
Symbol
THR
Read Only) bit description
DLAB = 0, Write Only) bit description
Description
The UART1 Receiver Buffer Register contains the oldest
received byte in the UART1 RX FIFO.
Description
Writing to the UART1 Transmit Holding Register causes the data
to be stored in the UART1 transmit FIFO. The byte will be sent
when it reaches the bottom of the FIFO and the transmitter is
available.
Rev. 04 — 26 August 2009
(Equation
17–3). The U1DLL and U1DLM registers together
Chapter 17: LPC24XX UART1
UM10237
© NXP B.V. 2009. All rights reserved.
Reset Value
undefined
Reset Value
NA
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