The ICS9147-01 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro. Two bidirectional I/O pins (FS1,FS2) are latched at power-on to the functionality table, with FS0 selectable in real-time to toggle between conditions. The inputs provide for tristate and test mode conditions to aid in system level testing. These multiplying factors can be customized for specific applications. Glitch-free stop clockcontrols are provided for CPU clocks and BUS clocks.