DP8571A - National Semiconductor

DP8571A Timer Clock Peripheral (TCP)

The DP8571A is 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 circuit’s architecture is such that it looks like a co.

Features

Y Y Y Y Y Y Full function real time clock calendar 12 24 hour mode timekeeping Day of week and day of years counters Four selectable oscillator frequencies Parallel resonant oscillator Two 16-bit timers 10 MHz external clock frequency Programmable multi-function output Flexible re-trigger facilities Power fail features 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 Periodic alarm timer and power fail interrupts Up to 44 bytes of CMOS RAM INTR MFO pins programmable High Low and .