Z8F082ASH020SC datasheet(156/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

Flash Option Bits

Z8 Encore! XP® F08xA Series

Product Specification

138

Flash Option Bits

Overview

Programmable Flash Option Bits allow user configuration of certain aspects of Z8 Encore!

XP® F08xA Series operation. The feature configuration data is stored in the Flash Pro-

gram Memory and read during Reset. The features available for control through the Flash

Option Bits are:

• Watch-Dog Timer time-out response selection–interrupt or system reset

• Watch-Dog Timer enabled at Reset

• The ability to prevent unwanted read access to user code in Program Memory

• The ability to prevent accidental programming and erasure of all or a portion of the user

code in Program Memory

• Voltage Brown-Out configuration-always enabled or disabled during STOP mode to re-

duce STOP mode power consumption

• Voltage Brown-Out response selection–interrupt or System Reset

• Oscillator mode selection-for high, medium, and low power crystal oscillators, or external

RC oscillator

• Factory trimming information for the Internal Precision Oscillator and Temperature Sen-

sor

• Factory calibration values for ADC compensation

Operation

Option Bit Configuration By Reset

Each time the Flash Option Bits are programmed or erased, the device must be Reset for

the change to take effect. During any reset operation (System Reset, system reset, or STOP

Mode Recovery), the Flash Option Bits are automatically read from the Flash Program

Memory and written to Option Configuration registers. The Option Configuration regis-

ters control operation of the devices within the Z8 Encore! XP® F08xA Series. Option Bit

control is established before the device exits Reset and the eZ8 CPU begins code execu-

tion. The Option Configuration registers are not part of the Register File and are not acces-

sible for read or write access.

Z8F082ASH020SC 데이터시트(PDF) 156 Page - Zilog, Inc.