User Manual

2.7 Using Red LED & 7-SEG LED Display
The red LED of the 7521 series can be turned-ON or turned-OFF by its
software program. The 5 digits of the seven-segment LED are also
programmable. The 5-digit LED is very useful in real world applications. It
can be used to replace the monitor & touch-screen for many applications.
2.8 Using RTC & NVSRAM
The RTC & NVSRAM are located on the same chip. There is a Li-battery
to backup the RTC & NVSRAM for 10 years. The features of the RTC are
given as follows:
• MiniOS7 supports RTC time & date
• Seconds, minutes, hours, date of the month
• Month, day of week, year, Leap year valid up to 2079
 NVSRAM: 31 bytes, data valid for 10 years
Note: the 7521 series can add a RTC/NVRAM for the OEM/ODM user.
7521/2/2A/3/4/7 Series Hardware User’s Manual, Ver. 1.5 Sep/2002, 7Mh-001-15 -----54