LPC2470FET208,551 NXP Semiconductors, LPC2470FET208,551 Datasheet - Page 438

• Manufacturer Part Number: LPC2470FET208,551
• Description: IC ARM7 MCU LCD 208-TFBGA
• Manufacturer: NXP Semiconductors
• Series: LPC2400r

Specifications of LPC2470FET208,551

• Package / Case: 208-TFBGA
• 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, LCD, POR, PWM, WDT
• Number Of I /o: 160
• Program Memory Type: ROMless
• 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
• Processor Series: LPC24
• Core: ARM7TDMI-S
• Data Bus Width: 16 bit, 32 bit
• Data Ram Size: 98 KB
• Interface Type: CAN/I2C/I2S/SPI/SSP/UART/USB
• Maximum Clock Frequency: 72 MHz
• Number Of Programmable I/os: 160
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2, MCB2470U
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• On-chip Dac: 1-ch x 10-bit
• Package: 208TFBGA
• Device Core: ARM7TDMI-S
• Family Name: LPC2000
• Maximum Speed: 72 MHz
• Operating Supply Voltage: 3.3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-4362; 935284071551; LPC2470FET208-S

NXP Semiconductors
UM10237_4
User manual
4.12.1 Baudrate calculation
Table 392. UARTn Fractional Divider Register (U0FDR - address 0xE000 C028,
This register controls the clock pre-scaler for the baud rate generation. The reset value of
the register keeps the fractional capabilities of UART0/2/3 disabled making sure that
UART0/2/3 is fully software and hardware compatible with UARTs not equipped with this
feature.
UART0/2/3 baudrate can be calculated as (n = 0/2/3):
Where PCLK is the peripheral clock, U0/2/3DLM and U0/2/3DLL are the standard
UART0/2/3 baud rate divider registers, and DIVADDVAL and MULVAL are UART0/2/3
fractional baudrate generator specific parameters.
The value of MULVAL and DIVADDVAL should comply to the following conditions:
The value of the U0/2/3FDR should not be modified while transmitting/receiving data or
data may be lost or corrupted.
If the U0/2/3FDR register value does not comply to these two requests, then the fractional
divider output is undefined. If DIVADDVAL is zero then the fractional divider is disabled,
and the clock will not be divided.
UART can operate with or without using the Fractional Divider. In real-life applications it is
likely that the desired baudrate can be achieved using several different Fractional Divider
settings. The following algorithm illustrates one way of finding a set of DLM, DLL,
MULVAL, and DIVADDVAL values. Such set of parameters yields a baudrate with a
relative error of less than 1.1% from the desired one.
Bit
3:0
7:4
31:8 -
1. 1 ≤ MULVAL ≤ 15
2. 0 ≤ DIVADDVAL ≤ 14
3. DIVADDVAL< MULVAL
Function
DIVADDVAL
MULVAL
U2FDR - 0xE007 8028, U3FDR - 0xE007 C028) bit description
UARTn
baudrate
Value Description
0
1
NA
Rev. 04 — 26 August 2009
=
Baud-rate generation pre-scaler divisor value. If this field is
0, fractional baud-rate generator will not impact the UARTn
baudrate.
Baud-rate pre-scaler multiplier value. This field must be
greater or equal 1 for UARTn to operate properly,
regardless of whether the fractional baud-rate generator is
used or not.
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
----------------------------------------------------------------------------------------------------------------------------------
16
×
(
256
×
UnDLM
+
PCLK
UnDLL
Chapter 16: LPC24XX UART0/2/3
)
×
⎛
⎝
1
+
DivAddVal
---------------------------- -
MulVal
UM10237
© NXP B.V. 2009. All rights reserved.
⎞
⎠
438 of 792
Reset
value
0
1
0
(2)