ST93C06CM6013TR datasheet(9/15 Pages) STMICROELECTRONICS

Part #	ST93C06CM6013TR

Description	256 bit 16 x 16 or 32 x 8 SERIAL MICROWIRE EEPROM

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Erase All

The Erase All instruction (ERAL) erases the whole

memory (all memory bits are set to ’1’). A dummy

address is input during the instruction transfer and

the erase is made in the same way as the ERASE

instruction. If the ST93C06 is still performing the

erase cycle, the Busy signal (Q = 0) will be returned

if S is driven high, and the ST93C06 will ignore any

data on the bus. When the erase cycle is com-

pleted, the Ready signal (Q = 1) will indicate (if S

is driven high) that the ST93C06 is ready to receive

a new instruction.

Write All

For correct operation, an ERAL instruction should

be executed before the WRAL instruction: the

WRAL instruction DOES NOT perform an automat-

ic erase before writing. The Write All instruction

(WRAL) writes the Data Input byte or word to all the

addresses of the memory. If the ST93C06 is still

performing the write cycle, the Busy signal (Q = 0)

will be returned if S is driven high, and the ST93C06

will ignore any data on the bus. When the write

cycle is completed, the Ready signal (Q = 1) will

indicate (if S is driven high) that the ST93C06 is

ready to receive a new instruction.

READY/BUSY Status

During every programming cycle (after a WRITE,

ERASE, WRAL or ERAL instruction) the Data Out-

put (Q) indicates the Ready/Busy status of the

memory when the Chip Select (S) is driven High.

Once the ST93C06 is Ready, the Ready/Busy

status is available on the Data Output (Q) until a

new start bit is decoded or the Chip Select (S) is

brought Low.

COMMON I/O OPERATION

The Data Output (Q) and Data Input (D) signals can

be connected together, through a current limiting

resistor, to form a common, one wire data bus.

Some precautions must be taken when operating

the memory with this connection, mostly to prevent

a short circuit between the last entered address bit

(A0) and the first data bit output by Q. The reader

may also refer to the SGS-THOMSON application

note ”MICROWIRE EEPROM Common I/O Opera-

tion”.

DIFF ERENCES BETWEEN ST93C06 AND

ST93C06C

Each instruction of the ST93C06 requires an Addi-

tional Dummy clock pulse after the rising edge of

the Chip Select input (S) and before the START bit,

see Figure 9. When replacing the ST93C06 with

the ST93C06C in an ap plication, it must be

checked that this Dummy Clock cycle DOES NOT

HAPPEN when D = 1: if it is so, this clock pulse will

latch an information which is decoded by the

ST93C06C as a START bit (see Figure 10) and the

following bits will be decoded with a shift of one bit.

AI01334

1

C

S

D

0

Dummy Clock pulse

START Bit

Figure 9. ST93C06 Timing

9/15

ST93C06, ST93C06C

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ST93C06CM6013TR Datasheet(PDF) 9 Page - STMicroelectronics

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