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AT93C86A Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT93C86A Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 18 page 5 AT93C86A 3408H–SEEPR–1/07 Functional Description The AT93C86A is accessed via a simple and versatile three-wire serial communication interface. Device operation is controlled by seven instructions issued by the host pro- cessor. A valid instruction starts with a rising edge of CS and consists of a Start Bit (logic “1”) followed by the appropriate Op Code and the desired memory address location. READ (READ): The Read (READ) instruction contains the address code for the mem- ory location to be read. After the instruction and address are decoded, data from the selected memory location is available at the serial output pin DO. Output data changes are synchronized with the rising edges of serial clock SK. It should be noted that a dummy bit (logic “0”) precedes the 8- or 16-bit data output string. The AT93C86A sup- ports sequential read operations. The device will automatically increment the internal address pointer and clock out the next memory location as long as CS is held high. In this case, the dummy bit (logic “0”) will not be clocked out between memory locations, thus allowing for a continuous stream of data to be read. ERASE/WRITE (EWEN): To assure data integrity, the part automatically goes into the Erase/Write Disable (EWDS) state when power is first applied. An Erase/Write Enable (EWEN) instruction must be executed first before any programming instructions can be carried out. Please note that once in the EWEN state, programming remains enabled until an EWDS instruction is executed or VCC power is removed from the part. ERASE (ERASE): The Erase (ERASE) instruction programs all bits in the specified memory location to the logical “1” state. The self-timed erase cycle starts once the ERASE instruction and address are decoded. The DO pin outputs the Ready/Busy sta- tus of the part if CS is brought high after being kept low for a minimum of 250 ns (tCS). A logic “1” at pin DO indicates that the selected memory location has been erased, and the part is ready for another instruction. WRITE (WRITE): The Write (WRITE) instruction contains the 8 or 16 bits of data to be written into the specified memory location. The self-timed programming cycle tWP starts after the last bit of data is received at serial data input pin DI. The DO pin outputs the Ready/Busy status of the part if CS is brought high after being kept low for a minimum of Table 5. Instruction Set for the AT93C86A Instruction SB Op Code Address Data Comments x 8 x 16 x 8 x 16 READ 1 10 A10 – A0 A9 – A0 Reads data stored in memory, at specified address. EWEN 1 00 11XXXXXXXXX 11XXXXXXXX Write enable must precede all programming modes. ERASE 1 11 A10 – A0 A9 – A0 Erases memory location An – A0. WRITE 1 01 A10 – A0 A9 – A0 D7 – D0 D15 – D0 Writes memory location An – A0. ERAL 1 00 10XXXXXXXXX 10XXXXXXXX Erases all memory locations. Valid only at VCC = 4.5V to 5.5V. WRAL 1 00 01XXXXXXXXX 01XXXXXXXX D7 – D0 D15 – D0 Writes all memory locations. Valid when VCC = 4.5V to 5.5V and Disable Register cleared. EWDS 1 00 00XXXXXXXXX 00XXXXXXXX Disables all programming instructions. |
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