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(12) RTC (Real-Time Clock)
Symbol
Name
Address
SECR
Second
320H
Reg
MINR
Minute
321H
Reg
HOURR
Hour
322H
Reg
DAYR
Day
323H
Reg
DATER
Date
324H
Reg
Month
325H
MONTHR
Reg
PAGE0
PAGE1
YEARR
Year
326H
Reg
PAGE0
PAGE1
PAGER
Page
327H
Reg(Prohi
bit RMW)
RESTR
Reset
328H
Reg(Prohi
bit RMW)
7
6
5
SE6
SE5
"0"
40 sec.
20 sec.
MI6
MI5
"0"
40 min.
20 min.
HO5
"0"
"0"
20 hour
(PM/AM)
"0"
"0"
"0"
DA5
"0"
"0"
20 day
"0"
"0"
"0"
YE7
YE6
YE5
80 year
40 year
20 year
--
--
--
INTRTC
R/W
0
INT
ENABLE
DIS1HZ
DIS16HZ
RSTTMR
0: 1HZ
0: 16HZ
1: RESET
TIMER
91C815-
4
3
SE4
SE3
SE2
R/W
Undefined
10 sec.
8 sec.
4 sec.
MI4
MI3
MI2
R/W
Undefined
10 min.
8 min.
4 min.
HO4
HO3
HO2
R/W
Undefined
10 hour
8 hour
4 hour
WE2
"0"
"0"
WE2
DA4
DA3
DA2
R/W
Undefined
10 day
8 day
4 day
MO4
MO3
MO2
R/W
Undefined
10 month
8 month
4 month
--
--
YE4
YE3
YE2
R/W
Undefined
10 year
8 year
4 year
--
--
ADJUST
ENATMR
ENAALM
W
R/W
--
Undefined
ADJUST
TIMER
ALARM
ENABLE
ENABLE
RSTALM
RE3
RE2
W
Undefined
1:RESET
ALARM
268
TMP91C815
2
1
0
SE1
SE0
2 sec.
1 sec.
MI1
MI0
2 min.
1min.
HO1
HO0
2 hour
1 hour
WE1
WE0
R/W
Undefined
WE1
WE0
DA1
DA0
2 day
1 day
MO1
MO0
2 month
1 month
--
--
0: Indicator
for 12 hours
1: Indicator
for 24 hours
YE1
YE0
2 year
1 year
--
Leap year setting
PAGE
R/W
Undefined
PAGE
setting
RE1
RE0
Always write 0.
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