z8f0813 ZiLOG Semiconductor, z8f0813 Datasheet - Page 151

• Manufacturer Part Number: z8f0813
• Description: High-performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Flash Option Bits
Operation
PS024314-0308
Option Bit Configuration By Reset
Option Bit Types
Programmable Flash option bits allow user configuration of certain aspects of
Z8 Encore! XP
Flash program memory and loaded into holding registers during Reset. The features
available for control through the Flash Option Bits include:
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, Power-On 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 registers control operation of the devices within the Z8 Encore! XP F0823
Series. Option Bit control is established before the device exits Reset and the eZ8 CPU
begins code execution. The Option Configuration registers are not part of the Register File
and are not accessible for read or write access.
User Option Bits
The user option bits are contained in the first two bytes of program memory. Access to
these bits has been provided because these locations contain application-specific device
•
•
•
•
•
•
•
•
Watchdog Timer time-out response selection–interrupt or system reset
Watchdog Timer always on (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 Brownout configuration-always enabled or disabled during STOP mode to
reduce STOP mode power consumption
Factory trimming information for the internal precision oscillator
Factory calibration values for ADC
Factory serialization and randomized lot identifier (optional)
®
F0823 Series operation. The feature configuration data is stored in the
Z8 Encore! XP
Product Specification
®
Flash Option Bits
F0823 Series
141