LPC2470FET208,551 NXP Semiconductors, LPC2470FET208,551 Datasheet - Page 529

• 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
5.3 Slave operation
5.4 Exception conditions
Note: A read or write of the SPI data register is required in order to clear the SPIF status
bit. Therefore, if the optional read of the SPI data register does not take place, a write to
this register is required in order to clear the SPIF status bit.
The following sequence describes how one should process a data transfer with the SPI
block when it is set up to be a slave. This process assumes that any prior data transfer
has already completed. It is required that the system clock driving the SPI logic be at least
8X faster than the SPI.
Note: A read or write of the SPI data register is required in order to clear the SPIF status
bit. Therefore, at least one of the optional reads or writes of the SPI data register must
take place, in order to clear the SPIF status bit.
Read Overrun
A read overrun occurs when the SPI block internal read buffer contains data that has not
been read by the processor, and a new transfer has completed. The read buffer
containing valid data is indicated by the SPIF bit in the status register being active. When
a transfer completes, the SPI block needs to move the received data to the read buffer. If
the SPIF bit is active (the read buffer is full), the new receive data will be lost, and the read
overrun (ROVR) bit in the status register will be activated.
Write Collision
As stated previously, there is no write buffer between the SPI block bus interface, and the
internal shift register. As a result, data must not be written to the SPI data register when a
SPI data transfer is currently in progress. The time frame where data cannot be written to
the SPI data register is from when the transfer starts, until after the status register has
been read when the SPIF status is active. If the SPI data register is written in this time
frame, the write data will be lost, and the write collision (WCOL) bit in the status register
will be activated.
Mode Fault
5. Read the SPI status register.
6. Read the received data from the SPI data register (optional).
7. Go to step 3 if more data is required to transmit.
1. Set the SPI control register to the desired settings.
2. Write the data to transmitted to the SPI data register (optional). Note that this can only
3. Wait for the SPIF bit in the SPI status register to be set to 1. The SPIF bit will be set
4. Read the SPI status register.
5. Read the received data from the SPI data register (optional).
6. Go to step 2 if more data is required to transmit.
be done when a slave SPI transfer is not in progress.
after the last sampling clock edge of the SPI data transfer.
Rev. 04 — 26 August 2009
Chapter 19: LPC24XX SPI
UM10237
© NXP B.V. 2009. All rights reserved.
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