69CHAPTER 5 CLOCK GENERATORCHAPTER 5 CLOCK GENERATOR5.1 Clock Generator FunctionsThe clock generator generates the clock to be supplied to the CPU and peripheral hardware. The following typeof system clock oscillator is available.Main system clock oscillatorThis circuit oscillates at frequencies of 1 to 5.0 MHz. Oscillation can be stopped by executing the STOP instruction.5.2 Clock Generator ConfigurationThe clock generator consists of the following hardware.Table 5-1. Clock Generator ConfigurationItem ConfigurationControl register Processor clock control register (PCC)Oscillation mode selection register (OSMS)Oscillator Main system clock oscillator