Page 131 - Making PIC Microcontroller Instruments and Controllers

SOCKEI U6_REAL.TIME CLOCKS 121

35
o-
o-
o-
1 2

1 9 22

REAL.T ME CLOCK. OPTION 1

-----o THE 7 LTNES MARKED L|KE Tl{S ARE
THE 7 LINES THAT GO TO THE 20 x 2
DISPLAY IT,ODULE.
TH S NoTAT oN
IS USED TI ]AOUGHOUTTHE
BOOK.
rifElll9li5.:i: Ctock implemented using lC NJU6355. (To lhe [.lCU, lhis clock lC looks ike a set
of memory locations.)

The same is true for the other chips. See Fig res 7.6 and 7.7.
The NJU6355, the DS1202, and the DS I3U ftal ti le docks are the three integrated
citcuits for use in socket U6.

Nole 1 Jumpet JS v,hichis usedfor soldering in the ctystalfor the clock ICs is dlso
the connection that the anulog signal for the l2-bit A-to'D co efter goes into. So, iJ
Jo solder in a crystul, fouwill h e to remove the crystaL a d make arra gements to
rcad in the analog siqnal \rhen you wa t to erperiment with the LTCI298 L2-bn A-b-
D conyerter The A-to-D convefter uses the same socket (U6) as k used bt the three