Z8F082ASH020SC Datasheet, PDF (156/244 Pages) Zilog, Inc. – Z8 Encore XP-R F08xA Series with eXtended Peripherals

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.
PS024705-0405
PRELIMINARY
Flash Option Bits