HT67F60 datasheet(169/242 Pages) HOLTEK

169 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPROM

Rev. 1.50

168

March 06 , 2012

Rev. 1.50

169

March 06 , 2012

I2C Interface

The I2C interface is used to communicate with external peripheral devices such as sensors,

EEPROM memory etc. Originally developed by Philips, it is a two line low speed serial interface for

synchronous serial data transfer. The advantage of only two lines for communication, relatively

simple communication protocol and the ability to accommodate multiple devices on the same bus

has made it an extremely popular interface type for many applications.

De vi ce

Sl av e

De vi ce

Ma st er

De vi ce

Sl av e

VD D

SD A

SC L

I2C Master Slave Bus Connection

● I2C Interface Operation

The I2C serial interface is a two line interface, a serial data line, SDA, and serial clock line, SCL.

As many devices may be connected together on the same bus, their outputs are both open drain

types. For this reason it is necessary that external pull-high resistors are connected to these

outputs. Note that no chip select line exists, as each device on the I2C bus is identified by a unique

address which will be transmitted and received on the I2C bus.

When two devices communicate with each other on the bidirectional I2C bus, one is known as the

master device and one as the slave device. Both master and slave can transmit and receive data,

however, it is the master device that has overall control of the bus. For these devices, which only

operates in slave mode, there are two methods of transferring data on the I2C bus, the slave

transmit mode and the slave receive mode.

There are several configuration options associated with the I2C interface. One of these is to enable

the function which selects the SIM pins rather than normal I/O pins. Note that if the configuration

option does not select the SIM function then the SIMEN bit in the SIMC0 register will have no

effect. A configuration option exists to allow a clock other than the system clock to drive the I2C

interface. Another configuration option determines the debounce time of the I2C interface. This

uses the internal clock to in effect add a debounce time to the external clock to reduce the

possibility of glitches on the clock line causing erroneous operation. The debounce time, if

selected, can be chosen to be either 1 or 2 system clocks.

HT67F60 Datasheet(PDF) 169 Page - Holtek Semiconductor Inc

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