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SC16IS750IBS Datasheet(HTML) 37 Page - NXP Semiconductors

Part No. SC16IS750IBS
Description  Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com

SC16IS750IBS Datasheet(HTML) 37 Page - NXP Semiconductors

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© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 06 — 13 May 2008
37 of 62
NXP Semiconductors
Single UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR
10. I2C-bus operation
The two lines of the I2C-bus are a serial data line (SDA) and a serial clock line (SCL). Both
lines are connected to a positive supply via a pull-up resistor, and remain HIGH when the
bus is not busy. Each device is recognized by a unique address whether it is a
microcomputer, LCD driver, memory or keyboard interface and can operate as either a
transmitter or receiver, depending on the function of the device. A device generating a
message or data is a transmitter, and a device receiving the message or data is a
receiver. Obviously, a passive function like an LCD driver could only be a receiver, while a
microcontroller or a memory can both transmit and receive data.
10.1 Data transfers
One data bit is transferred during each clock pulse (see Figure 16). The data on the SDA
line must remain stable during the HIGH period of the clock pulse in order to be valid.
Changes in the data line at this time will be interpreted as control signals. A HIGH-to-LOW
transition of the data line (SDA) while the clock signal (SCL) is HIGH indicates a START
condition, and a LOW-to-HIGH transition of the SDA while SCL is HIGH defines a STOP
condition (see Figure 17). The bus is considered to be busy after the START condition and
free again at a certain time interval after the STOP condition. The START and STOP
conditions are always generated by the master.
The number of data bytes transferred between the START and STOP condition from
transmitter to receiver is not limited. Each byte, which must be eight bits long, is
transferred serially with the most significant bit first, and is followed by an acknowledge bit
(see Figure 18). The clock pulse related to the acknowledge bit is generated by the
master. The device that acknowledges has to pull down the SDA line during the
acknowledge clock pulse, while the transmitting device releases this pulse (see
Figure 19).
Fig 16. Bit transfer on the I2C-bus
Fig 17. START and STOP conditions
data line
data valid
of data
STOP condition
START condition

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