TMP91C824
91C824-198
2008-02-20
3.13 Real
Time
Clock
(RTC)
3.13.1 Function Description for RTC
(1) Clock function (Second, minute, Hour, day of the week, day, Month and leap year)
(2) Calendar function
(3) 24- or 12-hour (AM/PM) clock function
(4)
±
30 second adjustment function (by software)
(5) Alarm output 1Hz/16Hz (from
ALARM
pin)
(6) Interrupt generate by Alarm output 1Hz/16Hz
3.13.2 Block
Diagram
Figure 3.13.1 RTC Block Diagram
Note 1: The Christian era year column:
This product has year column toward only lower two columns. Therefore the next year in 99
works as 00 years. In system to use it, please manage upper two columns with the system
side when handle year column in the Christian era.
Note 2: Leap year:
A leap year is the year, which is divisible with 4, but the year, which there is exception, and is
divisible with 100 is not a leap year. However, the year, which is divisible with 400, is a leap
year. But there is not this product for the correspondence to the above exception. Because
there are only with the year which is divisible with 4 as a leap year, please cope with the
system side if this function is problem.
Carry hold
(1 s)
Alarm register
Clock
Comparator
32 kHz
Clock: fs
INTRTC
Adjust
Read/Write control
Address
Bus
Data bus
WR
D0 to D7
Address
RD
Alarm
select
16 Hz
clock
1 Hz clock
Divider
ALARM
ALARM