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NUC220-LE1N Fiches technique(PDF) 82 Page - Nuvoton Technology Corporation

No de pièce NUC220-LE1N
Description  ARM짰 Cortex짰-M 32-bit Microcontroller
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
Logo NUVOTON - Nuvoton Technology Corporation

NUC220-LE1N Fiches technique(HTML) 82 Page - Nuvoton Technology Corporation

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NUC100/120xxxDN
Aug 31, 2015
Page 82 of 107
Rev 1.01
I
2C Serial Interface Controller (I2C)
6.17
6.17.1
Overview
I
2C is a two-wire, bidirectional serial bus that provides a simple and efficient method of data
exchange between devices. The I
2C standard is a true multi-master bus including collision
detection and arbitration that prevents data corruption if two or more masters attempt to control
the bus simultaneously.
Data is transferred between a Master and a Slave. Data bits transfer on the SCL and SDA lines
are synchronously on a byte-by-byte basis. Each data byte is 8-bit long. There is one SCL clock
pulse for each data bit with the MSB being transmitted first, and an acknowledge bit follows each
transferred byte. Each bit is sampled during the high period of SCL; therefore, the SDA line may
be changed only during the low period of SCL and must be held stable during the high period of
SCL. A transition on the SDA line while SCL is high is interpreted as a command (START or
STOP). Please refer to Figure 6-17 for more detailed I
2C BUS Timing.
tBUF
STOP
SDA
SCL
START
tHD;STA
tLOW
tHD;DAT
tHIGH
tf
tSU;DAT
Repeated
START
tSU;STA
tSU;STO
STOP
tr
Figure 6-17 I
2C Bus Timing
The device’s on-chip I2C logic provides a serial interface that meets the I2C bus standard mode
specification. The I
2C port handles byte transfers autonomously. To enable this port, the bit ENS1
in I2CON should be set to '1'. The I
2C hardware interfaces to the I2C bus via two pins: SDA and
SCL. Pull-up resistor is needed for I
2C operation as the SDA and SCL are open drain pins. When
I/O pins are used as I
2C ports, user must set the pins function to I2C in advance.


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