Real Time Clock (Rtc) - Toshiba TLCS-900/L1 Series Manual

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
(6) Interrupt generate by Alarm output 1Hz/16Hz
3.13.2 Block Diagram
32 kHz
Clock: fs
Carry hold
(1 s)
Adjust
RD
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.
ALARM
Divider
Comparator
Clock
Address
Bus
Read/Write control
WR
D0 to D7
Figure 3.13.1 RTC Block Diagram
91C824-198
pin)
16 Hz clock
1 Hz clock
Alarm register
ALARM
Data bus
Address
TMP91C824
ALARM
Alarm
INTRTC
select
2008-02-20