The DP8570AV/NOPB is a Timer Control Peripheral (TCP) intended for use in microprocessor based systems where information is required for multi-tasking, data logging or general time of day/date information. This device is implemented in low voltage silicon gate microCMOS technology to provide low standby power in battery back-up environments. The circuits architecture is such that it looks like a contiguous block of memory or I/O ports. The address space is organized as 2 software selectable pages of 32 bytes. This includes the control registers, the clock counters, the alarm compare RAM, the timers and their data RAM and the time save RAM. Any of the RAM locations that are not being used for their intended purpose may be used as general purpose CMOS RAM. Time and date are maintained from 1/100 of a second to year and leap year in a BCD format, 12 or 24-hour modes. Day of week, day of month and day of year counters are provided.
● Full function real time clock/calendar
● Two 16-bit timers
● Internal power supply switch to external battery
● Power supply bus glitch protection
● Automatic log of time into RAM at power failure
● On-chip interrupt structure
● Up to 44-byte of CMOS RAM
● INTR/MFO/T1 pins programmable High/Low and push-pull or open drain
● Green product and no Sb/Br
