Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 253

• Manufacturer Part Number: Z8FMC04100
• Description: Z8 Encore-R Motor Control Flash MCUs
• Manufacturer: ZILOG [Zilog, Inc.]

Oscillator Control
PS024604-1005
Operation
System Clock Selection
The Z8FMC16100 Series Flash MCU uses three possible clocking schemes, each user-
selectable:
•
•
•
In addition, Z8FMC16100 Series Flash MCUs contain clock failure detection and recov-
ery circuitry, allowing continued operation despite any potential failure of the primary
oscillator.
The on-chip system clock frequency can be reduced via a clock divider allowing reduced
dynamic power dissipation. Flash memory can be powered down during portions of the
clock period when running slower than 10 MHz.
This section explains the logic used to select the system clock, divide down the system
clock, and handle oscillator failures. A description of the specific operation of each oscil-
lator is outlined elsewhere in this document. Refer to
63, the
chapter on page 239.
The oscillator control block selects from the available clocks. Table 129 details each clock
source and its usage.
Trimmable Internal Precision Oscillator
On-chip oscillator using off-chip crystal/resonator or external clock driver
On-chip low precision Watch-Dog Timer oscillator
On-Chip Oscillator
chapter on page 237, and the
P R E L I M I N A R Y
Z8FMC16100 Series Flash MCU
Watch-Dog Timer
Internal Precision Oscillator
Product Specification
chapter on page
Operation
231