ZUSBOPTSC01ZAC datasheet(256/402 Pages) ZILOG

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Oscillator Control

P R E L I M I N A R Y

PS024604-1005

Z8 Encore!® Motor Control Flash MCUs

Product Specification

234

Oscillator Divide Register

The Oscillator Divide Register (OSCDIV) provides the value that divides the system

clock. The Oscillator Divide Register must be unlocked before writing. Writing the two-

step sequence E7h, followed by 18h, to the Oscillator Control Register address unlocks

the register. The register locks after completion of a register Write to the OSCDIV.

Bit

Position

Value

(H)

Description

[7]

INTEN

Internal Precision Oscillator Enable

Internal precision oscillator is disabled.

Internal precision oscillator is enabled.

[6]

XTLEN

Crystal Oscillator Enable

Crystal oscillator is disabled.

Crystal oscillator is enabled.

[5]

WDTEN

Watch-Dog Timer Oscillator Enable

Watch-Dog Timer oscillator is disabled

Watch-Dog Timer oscillator is enabled

[4]

POFEN

Primary Oscillator Failure Detection Enable

Failure detection and recovery of primary oscillator is disabled. This bit is cleared

automatically if a primary oscillator failure is detected.

Failure detection and recovery of primary oscillator is enabled

[3]

WDFEN

Watch-Dog Timer Oscillator Failure Detection Enable

Failure detection of Watch-Dog Timer oscillator is disabled.This bit is cleared

automatically if a Watch-Dog Timer oscillator failure is detected.

Failure detection of Watch-Dog Timer oscillator is enabled

[2]

FLPEN

Flash Low Power Mode Enable

Flash Low Power Mode is disabled.

Flash Low Power Mode is enabled. The Flash will be powered down during idle

periods of the clock and powered up during Flash reads. This bit should only be

set if the frequency of the primary oscillator source is 8MHz or lower. The reset

value of this bit is controlled by the LPDEN option bit during reset.

[1:0]

SCKSEL

System Clock Oscillator Select

Internal precision oscillator functions as system clock at 5.6 MHz

Crystal oscillator or external clock driver functions as system clock

Reserved

Watch-Dog Timer oscillator functions as system clock

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