Selcall Tone Codec with Microprocessor Interface

Features/Applications
Single-Chip Selcall Codec
CCIR, EEA or ZVEI/SZVEI Versions
On-Chip General Purpose Timer
Separate General Purpose
4-bit input/2-bit Output Port
Mobile or Handheld Selcall
4-bit Microprocessor I/O Data Port
Powersave Facility
       Uses Low-Cost 4MHz Xtal
Low-Power 5V CMOS Process