CALENDAR/CLOCK
SECTION 7
Page 7-1 RPC-320
DESCRIPTION
An optional DS1216DM calendar/clock module m ay be
installed in U5. The DS1216D M also battery backs
R A M .
The DS1216DM from Remote Processing is a modified
version of the Dallas DS1216D. An internal reset line
has been cut. When a 512K RAM is installed, an
additional line is cut and another soldered. Contact
Remote P rocessing for de tails.
Battery life depends greatly upon the ambient
t e mp e r at ur e . B at te r y li fe d eg r a de s up to 5 0% a t 5 0° C ,
using 25°C as a refer ence. RAM size and type also
affect battery life. Generally, you can expect a battery
life of 3 to 5 years.
Accuracy is about 1 minute/month and is not adjustable.
Hour s are exp ressed in 2 4-hour fo rma t.
Refer to the RPBASIC -52 Software Supplement for
more com mand information.
The cloc k module is installed by first r emoving the IC in
U5. Then, install the DS1 216DM into the socket. Install
the RAM chip into the socket. W hen installing a 32K
RAM chip, the top two pins in the DS1216DM ar e left
open.
Refer to
CHAPTER 5
for information about using battery
backed RAM and jumper setting when installing a 512K
R A M .
WARNING:
An additional modification to the
DS1216DM is necessary when
installing a 512K RAM. C ontact
Remote P rocessing for de tails.
SETTING DATE AND TIME
S e t t he d at e t o t ur n o n t he c lo c k m o d ul e . D at e a n d t im e
are set w hile runnin g a progr am or in the imm ediate
mode. Date and time are treated as number s and not
strings. To set the date and time:
DATE 95,11,28
TIME 13,23,43
The time is set to 1:23:43 PM.
NOTE:
The clock module is turned off as shipped from
the factory. DATE and TIME functions return
a HA RDW ARE erro r until DA TE is se t first.
T o r et r ie v e d a te a nd ti m e a s pa r t o f a p r o gr a m :
100 PRINT "Time: ",
110 FOR N=0 TO 2
120 PRINT TIME(N),
130 NEXT
140 PRINT "Date: ",
150 FOR N=0 TO 2
160 PRINT DATE(N),
170 NEXT
180 PRINT CR,
190 GOTO 100
run
Time: 13 24 12 Date: 94 11 14
When the clock mo dule is missing , de fective, or the date
has not been set, a HARD WARE er ror (code 50 at
address 101H) is returned by RPBASIC when a DATE
or TIM E function is performed. Use ONE RR to trap for
t hi s e r r or a n d r e p or t th e pr o b le m .
COMMANDS
The following is a list of RPBASIC-52 commands for
the calendar/clock.
Comm and
Function
DATE
Sets date and tur ns on mod ule
DAT E(n)
Return s date
T I M E
S e ts ti m e
TIME (n)
R e tu r n s t im e