CDP1879C-1 Datasheet PDF File

CMOS Peripherals CDP1879, CDP1879C-1 iN'f RESET POWER DOWN iii) X-O, MEM TPB, Wii TPA CS A2 AI AD VSS' I 2 5 4 5 6 7 B 9 10 II 12 24 VDD 23 XTAL 22 XTAL 21 CLOCK OUT 20 DB7 19 DBS IB DBS 17 OB4 16 OB3 15 OB2 14 OBl 15 OBO 92CS-54345RI TERMINAL ASSIGNMENT CMOS Real-Time Clock Features CPU interface for use with general-purpose microprocessors Time of day, calendar Reads seconds, minutes, hours Reads day of month and month Alarm circuit with seconds, minutes or hours operati

CDP1879, CDP1879C-1 March 1997 CMOS Real-Time Clock Description The CDP1879 real-time clock supplies time and calendar information from seconds to months in BCD format. It consists of 5 separately addressable and programmable counters that divide down an oscillator input. The clock input can have any one of 4 possible frequencies, allowing exibility in the choice of crystal or external clock sources. Using an external 32kH- clock source, timekeeping can be performed down to 2.5V (see Standby (