Z8F0113HJ005EG Datasheet, PDF (155/245 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F0823 Series
Product Specification
140
Page Erase
The Flash memory can be erased one page (512 bytes) at a time. Page Erasing the Flash
memory sets all bytes in that page to the value FFH. The Flash Page Select register identi-
fies the page to be erased. Only a page residing in an unprotected sector can be erased.
With the Flash Controller unlocked and the active page set, writing the value 95h to the
Flash Control Register initiates the Page Erase operation. While the Flash Controller exe-
cutes the Page Erase operation, the eZ8 CPU idles but the system clock and on-chip
peripherals continue to operate. The eZ8 CPU resumes operation after the Page Erase
operation completes. If the Page Erase operation is performed using the On-Chip Debug-
ger, poll the Flash Status Register to determine when the Page Erase operation is complete.
When the Page Erase is complete, the Flash Controller returns to its locked state.
Mass Erase
The Flash memory can also be Mass Erased using the Flash Controller, but only by using
the On-Chip Debugger. Mass Erasing the Flash memory sets all bytes to the value FFH.
With the Flash Controller unlocked and the Mass Erase successfully enabled, writing the
value 63H to the Flash Control Register initiates the Mass Erase operation. While the
Flash Controller executes the Mass Erase operation, the eZ8 CPU idles but the system
clock and on-chip peripherals continue to operate. Using the On-Chip Debugger, poll the
Flash 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.
Flash Controller Bypass
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 Row Program-
ming 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. Page
Erase operations are also supported when the Flash Controller is bypassed.
For more information about bypassing the Flash Controller, refer to the Zilog application
note titled, Third-Party Flash Programming Support for Z8 Encore! MCUs (AN0117),
available for download at www.zilog.com.
Flash Controller Behavior in DEBUG Mode
The following changes in behavior of the Flash Controller occur when the Flash Control-
ler is accessed using the On-Chip Debugger:
• The Flash Write Protect option bit is ignored
• The Flash Sector Protect register is ignored for programming and erase operations
PS024315-1011
PRELIMINARY
Operation