DS1207

021798 12/17

FLOW CHART: PROGRAM MODE, STOP OSCILLATOR Figure 10

Write Command

NO

Stop

Oscillator Stopped

RESET High

RESET Low

24 Bits Including

Function Code

Output in High Z

Match

Program Mode

to Stop Oscillator

SETTING THE TIME UNTIL EXPIRATION OF THE DS1207 Figure 11

Step 1

Program identification memory

Program security match bits

Write normal mode secure data

Step 2

Program write the number of days remaining

Program read the number of days remaining for verification

Step 3*

Issue arm oscillator command

Step 4*

Do a read of any kind

Step 5*

Program read the day clock counter several times (verify that the oscillator is running)

Step 6*

Issue the stop oscillator command

Step 7

Issue the lock command

Step 8

Issue the arm oscillator command

(time of expiration will start on first access)

* This is a stress rating only and functional operation of the device at these or any other conditions above

those indicated in the operation sections of this specification is not implied. Exposure to absolute maxi-

mum rating conditions for extended periods of time may affect reliability.