CDP1879 Overview
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.
CDP1879 Key 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
