z8f0822 ZiLOG Semiconductor, z8f0822 Datasheet - Page 168
z8f0822
Manufacturer Part Number
z8f0822
Description
High Performance 8-bit Microcontrollers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z8F0822.pdf
(264 pages)
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Operation
PS022517-0508
Caution:
Timing Using the Flash Frequency Registers
Table 82. Z8 Encore! XP
The Flash Controller provides the proper signals and timing for Byte Programming, Page
Erase, and Mass Erase of the Flash memory. The Flash Controller contains a protection
mechanism, using the Flash Control Register (FCTL), to prevent accidental programming
or erasure. The following subsections provide details on the various operations (Lock,
Unlock, Sector Protect, Byte Programming, Page Erase, and Mass Erase).
Before performing a program or erase operation on the Flash memory, you must first
configure the Flash Frequency High and Low Byte registers. The Flash Frequency
registers allow programming and erasure of the Flash with system clock frequencies
ranging from 20 kHz through 20 MHz (the valid range is limited to the device operating
frequencies).
The Flash Frequency High and Low Byte registers combine to form a 16-bit value,
FFREQ, to control timing for Flash program and erase operations. The 16-bit Flash
Frequency value must contain the system clock frequency in kHz. This value is calculated
using the following equation:
FFREQ[15:0]
Flash Memory Address (Hex)
Flash programming and erasure are not supported for system clock fre-
quencies below 20 kHz, above 20 MHz, or outside of the device operating
frequency range. The Flash Frequency High and Low Byte registers must
be loaded with the correct value to insure proper Flash programming and
erase operations.
FE00H-FE3FH
FE54H-FFFFH
FE40H-FE53H
=
System Clock Frequency (Hz)
------------------------------------------------------------------------------ -
®
1000
F0822 Series Information Area Map
Function
Reserved
Part Number
20-character ASCII alphanumeric code
Left justified and filled with zeros
Reserved
Z8 Encore! XP
Product Specification
®
F0822 Series
Flash Memory
155
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