Z8F6421AN00ZEM Zilog, Z8F6421AN00ZEM Datasheet - Page 199

• Manufacturer Part Number: Z8F6421AN00ZEM
• Description: KIT ICE Z8 ENCORE 64K 44LQFP
• Manufacturer: Zilog
• Series: Z8 Encore!®r
• Type: In-Circuit Emulator Systemr

Specifications of Z8F6421AN00ZEM

• Contents: Emulator Board, Cables, Software and Documentation
• For Use With/related Products: Z8 Encore! 44-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3392

PS019921-0308
Caution:
Mass Erase
Flash Controller Bypass
Flash Controller Behavior in Debug Mode
5. Re-write the page written in step 2 to the Page Select register.
6. Write the Page Erase command 95H to the Flash Control register.
The Flash memory cannot be Mass Erased by user code.
The Flash Controller can be bypassed and the control signals for the Flash memory
brought out to the GPIO pins. Bypassing the Flash Controller allows faster Programming
algorithms by controlling the Flash programming signals directly.
Flash Controller Bypass is recommended for gang programming applications and large
volume customers who do not require in-circuit programming of the Flash memory.
For more information on bypassing the Flash Controller, refer to Third-Party Flash Pro-
gramming Support for Z8 Encore! available for download at www.zilog.com.
The following changes in behavior of the Flash Controller occur when the Flash Control-
ler is accessed using the On-Chip Debugger:
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For security reasons, Flash controller allows only a single page to be opened for
write/erase. When writing multiple Flash pages, the Flash controller must go
through the unlock sequence again to select another page.
The Flash Write Protect option bit is ignored.
The Flash Sector Protect register is ignored for programming and erase operations.
Programming operations are not limited to the page selected in the Page Select
register.
Bits in the Flash Sector Protect register can be written to one or zero.
The second write of the Page Select register to unlock the Flash Controller is not
necessary.
The Page Select register can be written when the Flash Controller is unlocked.
The Mass Erase command is enabled through the Flash Control register.
Z8 Encore! XP
Product Specification
®
F64XX Series
Flash Memory
185