z8f083a ZiLOG Semiconductor, z8f083a Datasheet - Page 125

• Manufacturer Part Number: z8f083a
• Description: High-performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

NVDS Operational Requirements
PS026308-1207
Caution:
Flash Controller Bypass
Flash Controller Behavior in Debug Mode
status register to determine when the Mass Erase operation is complete. When the mass
erase is complete, the Flash controller returns to its Locked state.
The Flash controller is bypassed and the control signals for the Flash memory are brought
out to the GPIO pins. Bypassing the Flash controller allows faster row programming
algorithms by controlling the Flash programming signals directly.
Row programing is recommended for gang programming applications and large volume
customers who do not require in-circuit initial programming of the Flash memory. Mass
Erase and Page Erase operations are also supported, when the Flash controller is bypassed.
For more information about bypassing the Flash controller, refer to Third-Party Flash
Programming Support for Z8 Encore!
www.zilog.com.
The following behavioral changes are observed in the Flash controller when the Flash
controller is accessed using the On-Chip Debugger:
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The device uses a 12 KB Flash memory, despite the maximum specified Flash of 8 KB
size (except 12 KB mode with non-NVDS). User code accesses the lower 8 KB of flash,
leaving the upper 4 K for Zilog memory. The NVDS is implemented by using Zilog
memory for special purpose routines and for the data required by the routines. These
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 are 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 is written when the Flash controller is unlocked.
The mass erase command is enabled through the Flash control register
®
. This document is available for download at
Z8 Encore!
Product Specification
®
F083A Series
Flash Memory
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