Z8F0830HH020SG Datasheet, PDF (169/257 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore!^® F0830 Series
Product Specification
151
Oscillator Control
The Z8 Encore! F0830 Series device uses five possible clocking schemes. Each one of
these is user-selectable.
• On-chip precision trimmed RC oscillator
• On-chip oscillator using off-chip crystal or resonator
• On-chip oscillator using external RC network
• External clock drive
• On-chip low precision Watchdog Timer Oscillator
In addition, Z8 Encore! F0830 Series devices contain clock failure detection and recovery
circuitry, allowing continued operation despite a failure of the primary oscillator.
Operation
This chapter discusses the logic used to select the system clock and handle primary oscil-
lator failures. A description of the specific operation of each oscillator is outlined further
in this document.
System Clock Selection
The oscillator control block selects from the available clocks. Table 98 describes each
clock source and its usage.
PS025113-1212
Oscillator Control