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M58-LC Datasheet(PDF) 40 Page - Nuvoton Technology Corporation |
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M58-LC Datasheet(HTML) 40 Page - Nuvoton Technology Corporation |
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40 / 71 page  NuMicro ™ M058/M0516BN Datasheet Publication Release Date: Mar. 19, 2012 - 40 - Revision V1.01 6.5 I 2C Serial Interface Controller (Master/Slave) 6.5.1 Overview I 2C is a two-wire, bi-directional 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 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 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 6-13 I 2C Bus Timing The device’s on-chip I 2C provides the 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 H/W interfaces to the I2C bus via two pins: SDA (serial data line) and SCL (serial clock line). Pull up resistor is needed on pin SDA and SCL for I 2C operation as these are open drain pins. When the I/O pins are used as I 2C port, user must set the pins function to I 2C in advance. |
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Similar Description - M58-LC |
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