CDP1879C-1

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 operation Power down mode Separate clock output selects 1 of 15 square wave signals Interrupt output activated by clock output and/or alarm circuit Data integrity sampling for clock rollover eliminated On-board oscillator 4.19 MHz, 2.09 MHz or 1.048 MHz @ 10 V (CDP1879) crystal operation 4.19 MHz, 2.09 MHz, 1.048 MHz or 32 kHz @ 5 V (CDP1879C-1) crystal operation 4.19 MHz, 2.09 MHz, 1.048 MHz or 32 kHz @ 10 V or 5 V external clock operation Addressable in memory spac...