NM93C56M8X データシートの表示（PDF） - Fairchild Semiconductor

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NM93C56M8X

(MICROWIRE™ Bus Interface) 2048-Bit Serial EEPROM with Data Protect and Sequential Read

Fairchild Semiconductor 

instruction should be issued as listed under Table1. After inputting

the last bit of address (A0 bit), CS signal must be brought low

before the next rising edge of the SK clock. This falling edge of the

CS initiates the self-timed programming cycle. It takes tWP time

(Refer appropriate DC and AC Electrical Characteristics table) for

the internal programming cycle to finish. During this time, the

device remains busy and is not ready for another instruction.

Status of the internal programming can be polled as described

under WRITE instruction description. While the device is busy, it

is recommended that no new instruction be issued. The Protect

Register is permanently write-protected at the end of this cycle.

Refer Protect Register Disable cycle diagram.

Clearing of Ready/Busy status

When programming is in progress, the Data-Out pin will display

the programming status as either BUSY (low) or READY (high)

when CS is brought high (DO output will be tri-stated when CS is

low). To restate, during programming, the CS pin may be brought

high and low any number of times to view the programming status

without affecting the programming operation. Once programming

is completed (Output in READY state), the output is ‘cleared’

(returned to normal tri-state condition) by clocking in a Start Bit.

After the Start Bit is clocked in, the output will return to a tri-stated

condition. When clocked in, this Start Bit can be the first bit in a

command string, or CS can be brought low again to reset all

internal circuits. Refer Clearing Ready Status diagram.

Related Document

Application Note: AN758 - Using Fairchild’s MICROWIRE™ EE-

PROM.

NM93CS56 Rev. F.2

8

www.fairchildsemi.com

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