Toshiba TLCS-900/H1 Series Manual page 320

3.13 Real Time Clock (RTC)
3.13.1 Function Description for RTC
1) Clock function (hour, minute, second)
2) Calendar function (month and day, day of the week, and leap year)
3) 24- or 12-hour (AM/PM) clock function
4) +/−30 s adjustment function (by software)
5) Alarm function (alarm output)
6) Alarm interrupt generate
3.13.2 Block Diagram
32-kHz
clock
Carry
hold (1s)
Adjust
RD
Note 1: Western calendar year column:
This product uses only the final two digits of the year. Therefore, the year following 99 is 00
years. In use, please take into account the first two digits when handling years in the western
calendar.
Note 2: Leap year:
A leap year is divisible by 4, but the exception is any leap year which is divisible by 100; this is
not considered a leap year. However, any year which is divisible by 400, is a leap year. This
product does not take into account the above exceptions . Since this product accounts only for
leap years divisible by 4, please adjust the system for any problems.
16-Hz clock
Divider
1-Hz clock
Alarm register
Comparator
Clock
Data bus
Read/write control
Address
WR D0 to D7
Figure 3.13.1 RTC Block Diagram
92CH21-318
ALARM
Alarm
select
INTRTC
ALARM
TMP92CH21
2009-06-19