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M054LAN Datasheet(PDF) 34 Page - Nuvotem Talema

Part No. M054LAN
Description  ARM Cortex™-M0 32-BIT MICROCONTROLLER
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Maker  TALEMA [Nuvotem Talema]
Homepage  http://www.nuvotem.com
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M054LAN Datasheet(HTML) 34 Page - Nuvotem Talema

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M052/M054 Data Sheet
Publication Release Date: Mar 15, 2011
- 34 -
Revision V1.0
6.5 I2C Serial Interface Controller (Master/Slave)
6.5.1
Overview
I2C is a two-wire, bi-directional serial bus that provides a simple and efficient method of data
exchange between devices. The I2C 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 synchronously to SCL on the SDA line on a
byte-by-byte basis. Each data byte is 8 bits long. There is one SCL clock pulse for each data bit
with the MSB being transmitted first. 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 the Figure
6–13 for more detail I2C 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 6–13 I2C Bus Timing
The device’s on-chip I2C provides the serial interface that meets the I2C bus standard mode
specification. The I2C port handles byte transfers autonomously. To enable this port, the bit ENS1
in I2CON should be set to '1'. The I2C H/W interfaces to the I2C bus via two pins: SDA (Px.y,
serial data line) and SCL (Px.y, serial clock line). Pull up resistor is needed for Pin Px.y and Px.y
for I2C operation as these are open drain pins. When the I/O pins are used as I2C port, user must
set the pins function to I2C in advance.
6.5.2
Features
The I2C bus uses two wires (SDA and SCL) to transfer information between devices connected to
the bus. The main features of the bus are:
Support Master and Slave mode
Bidirectional data transfer between masters and slaves
Multi-master bus (no central master)
Arbitration between simultaneously transmitting masters without corruption of serial data
on the bus


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