M93C86 datasheet(9/31 Pages) STMICROELECTRONICS

9 / 31 page

9/31

M93C86, M93C76, M93C66, M93C56, M93C46

Read

The Read Data from Memory (READ) instruction

outputs data on Serial Data Output (Q). When the

instruction is received, the op-code and address

are decoded, and the data from the memory is

transferred to an output shift register. A dummy 0

bit is output first, followed by the 8-bit byte or 16-

bit word, with the most significant bit first. Output

data changes are triggered by the rising edge of

Serial Clock (C). The M93Cx6 automatically incre-

ments the internal address register and clocks out

the next byte (or word) as long as the Chip Select

Input (S) is held High. In this case, the dummy 0 bit

not output between bytes (or words) and a con-

tinuous stream of data can be read.

Erase/Write Enable and Disable

The Erase/Write Enable (EWEN) instruction en-

ables the future execution of erase or write instruc-

tions, and the Erase/Write Disable (EWDS)

instruction disables it. When power is first applied,

the M93Cx6 initializes itself so that erase and write

instructions are disabled. After an Erase/Write En-

able (EWEN) instruction has been executed, eras-

ing and writing remains enabled until an Erase/

Write Disable (EWDS) instruction is executed, or

until VCC falls below the power-on reset threshold

voltage. To protect the memory contents from ac-

cidental corruption, it is advisable to issue the

Erase/Write Disable (EWDS) instruction after ev-

ery write cycle. The Read Data from Memory

(READ) instruction is not affected by the Erase/

Write Enable (EWEN) or Erase/Write Disable

(EWDS) instructions.

Figure 4. READ, WRITE, EWEN, EWDS Sequences

Note: For the meanings of An, Xn, Qn and Dn, see Table 5., Table 6. and Table 7..

AI00878C

1 1 0 An

DATA OUT

READ

WRITE

ADDR

CODE

1 0An

DATA IN

CODE

BUSY

READY

ERASE

WRITE

ENABLE

0Xn X0

CODE

ERASE

WRITE

DISABLE

0Xn X0

CODE

CHECK

STATUS

ADDR

M93C86 Datasheet(PDF) 9 Page - STMicroelectronics

M93C86 Datasheet(HTML) 9 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Datasheet Descarga

Enlace URL