Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 261
Z8FMC04100
Manufacturer Part Number
Z8FMC04100
Description
Z8 Encore-R Motor Control Flash MCUs
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z8FMC04100.pdf
(402 pages)
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Internal Precision Oscillator
PS024604-1005
Operation
The Internal Precision Oscillator (IPO) is designed for use without external components.
The IPO comes factory trimmed a ±4% frequency accuracy over the operating tempera-
ture and supply voltage range of the device. IPO features include:
•
•
•
•
•
The internal oscillator is an RC relaxation oscillator that has had its sensitivity to power
supply variation minimized. By using ratio tracking thresholds, the effect of power supply
voltage is cancelled out. The dominant source of oscillator error is the absolute variance of
chip-level fabricated components, such as capacitors. Two 8-bit trimming registers, incor-
porated into the design, allow compensation of absolute variation of oscillator frequency.
Once calibrated, the oscillator frequency is relatively stable and does not require subse-
quent calibration.
By default, the oscillator is configured through the Flash Option bits. However, the user
code can override these trim values as described in
On-chip RC oscillator that does not require external components
Trimmed to ±4% accuracy
Target output frequency of 5.5296 MHz
Trimming possible through Flash option bits with user override
Can eliminate crystals or ceramic resonators in applications where high timing accura-
cy is not required.
P R E L I M I N A R Y
Trim Option Bits
Z8FMC16100 Series Flash MCU
Product Specification
section on page 223.
Operation
239
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