93LC86ATESTG datasheet(9/28 Pages) MICROCHIP

9 / 28 page

DS21797G-page 9

93AA86A/B/C, 93LC86A/B/C, 93C86A/B/C

2.6

Erase/Write Disable and Enable

(EWDS/EWEN)

The 93XX86A/B/C powers up in the Erase/Write

Disable (EWDS) state. All programming modes must be

preceded by an Erase/Write Enable (EWEN) instruction.

Once the EWEN instruction is executed, programming

remains enabled until an EWDS instruction is executed

or VCC is removed from the device.

To protect against accidental data disturbance, the

EWDS

instruction can be used to disable all Erase/Write

functions

and

should

all

programming

operations.

Execution

READ

instruction

independent of both the EWEN and EWDS instructions.

FIGURE 2-3:

EWDS TIMING

FIGURE 2-4:

EWEN TIMING

2.7

Read

The READ instruction outputs the serial data of the

addressed memory location on the DO pin. A dummy

zero bit precedes the 8-bit (If ORG pin is low or A-Version

devices) or 16-bit (If ORG pin is high or B-version

devices) output string.

The output data bits will toggle on the rising edge of the

CLK and are stable after the specified time delay (TPD).

Sequential read is possible when CS is held high. The

memory data will automatically cycle to the next register

and output sequentially.

FIGURE 2-5:

READ TIMING

CLK

•••

TCSL

CLK

TCSL

•••

CLK

•••

High-Z

•••

93LC86ATESTG データシート(PDF) 9 Page - Microchip Technology

93LC86ATESTG データシート(HTML) 9 Page - Microchip Technology

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

データシートダウンロード