Note the following details of the code protection feature on Microchip devices: Microchip products meet the specification contained in their particular Microchip Data Sheet. Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. Most likely, the person doing so is engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code.

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Single supply with operation down to 2. A standby current typical at 5. A standby current typical at 3. Organized as 8 blocks of bytes 8 x x 8?

Schmitt trigger inputs for noise suppression? Output slope control to eliminate ground bounce? Self-timed write cycle including auto-erase? Page-write buffer for up to 16 bytes?

Hardware write protect for entire memory? Can be operated as a serial ROM? Factory programming QTP available? The device is organized as eight blocks of x 8 bit memory with a 2-wire serial interface.

Low voltage design permits operation down to 2. A and 1 mA respectively. The 24LC16B also has a page-write capability for up to 16 bytes of data.

C Ambient temp. C Soldering temperature of leads 10 seconds C ESD protection on all pins This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this speci? Exposure to maximum rating conditions for extended periods may affect device reliability.

Max —. This eliminates the need for a TI speci? For endurance estimates in a speci? A device that sends data onto the bus is de? Both, master and slave can operate as transmitter or receiver but the master device determines which mode is activated. Data transfer may be initiated only when the bus is not busy. During data transfer, the data line must remain stable whenever the clock line is HIGH. Accordingly, the following bus conditions have been de?

All operations must be ended with a STOP condition. The data on the line must be changed during the LOW period of the clock signal. There is one clock pulse per bit of data.

The number of the data bytes transferred between the START and STOP conditions is determined by the master device and is theoretically unlimited, although only the last sixteen will be stored when doing a write operation.

When an overwrite does occur it will replace data in a? The master device must generate an extra clock pulse which is associated with this acknowledge bit. Note: The 24LC16B does not generate any acknowledge bits if an internal programming cycle is in progress. Of course, setup and hold times must be taken into account. During reads, a master must signal an end of data to the slave by not generating an acknowledge bit on the last byte that has been clocked out of the slave.

The control byte consists of a four bit control code, for the 24LC16B this is set as binary for read and write operations. The next three bits of the control byte are the block select bits B2, B1, B0. They are used by the master device to select which of the eight word blocks of memory are to be accessed. These bits are in effect the three most signi? It should be noted that the protocol limits the size of the memory to eight blocks of words, therefore the protocol can support only one 24LC16B per system.

The last bit of the control byte de? When set to one a read operation is selected, when set to zero a write operation is selected. This indicates to the addressed slave receiver that a byte with a word address will follow after it has generated an acknowledge bit during the ninth clock cycle. Therefore the next byte transmitted by the master is the word address and will be written into the address pointer of the 24LC16B.

After receiving another acknowledge signal from the 24LC16B the master device will transmit the data word to be written into the addressed memory location.

The 24LC16B acknowledges again and the master generates a stop condition. This initiates the internal write cycle, and during this time the 24LC16B will not generate acknowledge signals Figure But instead of generating a stop condition the master transmits up to 16 data bytes to the 24LC16B which are temporarily stored in the on-chip page buffer and will be written into the memory after the master has transmitted a stop condition.

After the receipt of each word, the four lower order address pointer bits are internally incremented by one. The higher order seven bits of the word address remains constant. If the master should transmit more than 16 words prior to generating the stop condition, the address counter will roll over and the previously received data will be overwritten.

As with the byte write operation, once the stop condition is received an internal write cycle will begin Figure Once the stop condition for a write command has been issued from the master, the device initiates the internally timed write cycle. ACK polling can be initiated immediately. If the device is still busy with the write cycle, then no ACK will be returned.

If the cycle is complete, then the device will return the ACK and the master can then proceed with the next read or write command. See Figure for? YES Next Operation 6.

Programming will be inhibited and the entire memory will be write-protected. There are three basic types of read operations: current address read, random read, and sequential read. The master will not acknowledge the transfer but does generate a stop condition and the 24LC16B discontinues transmission Figure To perform this type of read operation,?

This is done by sending the word address to the 24LC16B as part of a write operation. After the word address is sent, the master generates a start condition following the acknowledge. This terminates the write operation, but not before the internal address pointer is set. The 24LC16B will then issue an acknowledge and transmits the 8-bit data word. This directs the 24LC16B to transmit the next sequentially addressed 8-bit word Figure To provide sequential reads the 24LC16B contains an internal address pointer which is incremented by one at the completion of each operation.

This address pointer allows the entire memory contents to be serially read during one operation. DSG-page 6? The entire memory will be write-protected. Read operations are not affected. They may be left? Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates.

No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise.

No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. All rights reserved. All other trademarks mentioned herein are the property of their respective companies. DSG-page 12?





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Układ scalony 24LC16B-I/P DIP8


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