Z8F16800144ZCOG Zilog, Z8F16800144ZCOG Datasheet - Page 272

• Manufacturer Part Number: Z8F16800144ZCOG
• Description: KIT DEV FOR Z8F642 MCU 44 PIN
• Manufacturer: Zilog
• Series: Z8 Encore!®r
• Type: MCUr

Specifications of Z8F16800144ZCOG

• Contents: Hardware, Software and Documentation
• For Use With/related Products: Z8F642
• For Use With: 269-4661 - KIT ACC ETHERNET SMART CABLE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-4678

.
PS025011-1010
Caution:
Flash Operation Timing Using Flash Frequency Registers
Flash Code Protection Against External Access
Flash Code Protection Against Accidental Program and Erasure
Before performing either a program or erase operation on Flash memory, you must first
configure the Flash frequency High and Low Byte registers. The Flash frequency registers
allow programming and erasing of the Flash with system clock frequencies ranging from
32 kHz (32768 Hz) through 20 MHz.
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 binary Flash
frequency value must contain the system clock frequency (in kHz). This value is
calculated using the following equation:
The user code contained within the Flash memory can be protected against external 
access with the On-Chip Debugger. Programming the FRP Flash Option Bit prevents read-
ing of the user code with the On-Chip Debugger. For more details, see
on page 267 and
The Z8 Encore! XP F1680 Series provides several levels of protection against accidental
program and erasure of the Flash memory contents. This protection is provided by a
combination of the Flash Option bits, the register locking mechanism, the page select
redundancy, and the sector level protection control of the Flash Controller.
Flash Code Protection Using the Flash Option Bits
The FWP Flash Option Bit provides Flash Program Memory protection as listed in
Table
Table 134. Flash Code Protection Using the Flash Option Bit
FWP Flash Code Protection Description
0
1
Flash programming and erasure are not supported for system clock frequencies below
32 kHz (32768 Hz) or above 20 MHz. The Flash Frequency High and Low Byte registers
must be loaded with the correct value to ensure operation of the
Z8 Encore! XP F1680 Series devices.
FFREQ[15:0]
134. For more details, see
Programming and erasing disabled for all of Flash Program Memory. In user code
programming, Page Erase, and Mass Erase are all disabled. Mass Erase is
available through the On-Chip Debugger.
Programming, Page Erase, and Mass Erase are enabled for all of Flash Program
Memory.
On-Chip Debugger
=
System Clock Frequency (Hz)
------------------------------------------------------------------------------ -
P R E L I M I N A R Y
1000
Flash Option Bits
on page 285.
on page 267.
Z8 Encore! XP
Product Specification

Flash Option Bits
®
F1680 Series
Flash Memory
258