z8f1621 ZiLOG Semiconductor, z8f1621 Datasheet - Page 196
z8f1621
Manufacturer Part Number
z8f1621
Description
High Performance 8-bit Microcontrollers
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z8F1621.pdf
(297 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
z8f1621AN020EG
Manufacturer:
Zilog
Quantity:
356
Company:
Part Number:
z8f1621AN020SG
Manufacturer:
Zilog
Quantity:
918
Company:
Part Number:
z8f1621PM020SG
Manufacturer:
Zilog
Quantity:
673
Company:
Part Number:
z8f1621VN020SG
Manufacturer:
Zilog
Quantity:
6
- Current page: 196 of 297
- Download datasheet (9Mb)
PS019921-0308
Caution:
Flash Read Protection
Flash Write/Erase Protection
Timing Using the Flash Frequency Registers
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:.
The user code contained within the Flash memory can be protected from external access.
Programming the Flash Read Protect Option Bit prevents reading of user code by the On-
Chip Debugger or by using the Flash Controller Bypass mode. For more information, see
Option Bits
The Z8 Encore! XP
tal program and erasure of the Flash memory contents. This protection is provided by the
Flash Controller unlock mechanism, the Flash Sector Protect register, and the Flash Write
Protect option bit.
Flash Controller Unlock Mechanism
At Reset, the Flash Controller locks to prevent accidental program or erasure of the Flash
memory. To program or erase the Flash memory, the Flash controller must be unlocked.
After unlocking the Flash Controller, the Flash can be programmed or erased. Any value
written by user code to the Flash Control register or Page Select Register out of sequence
will lock the Flash Controller.
Follow the steps below to unlock the Flash Controller from user code:
1. Write 00H to the Flash Control register to reset the Flash Controller.
2. Write the page to be programmed or erased to the Page Select register.
Flash programming and erasure are not supported for system clock frequencies
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.
on page 191 and
FFREQ[15:0]
®
F64XX Series provides several levels of protection against acciden-
=
On-Chip Debugger
System Clock Frequency (Hz)
------------------------------------------------------------------------
1000
on page 195.
Z8 Encore! XP
Product Specification
®
F64XX Series
Flash Memory
182
Related parts for z8f1621
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Z8 Encore!? Microcontroller With Flash Memory And 10-bit A/d Converter
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Z8 Encore! Xp F64xx Series
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Z8 Encore Motor Control Flash Mcus
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Z8 Encore XP-R F08xA Series with eXtended Peripherals
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
Part Number:
Description:
Z8 Encore Microcontrollers with Flash Memory and 10-Bit A/D Converter
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
Part Number:
Description:
Z8 Encore-R Motor Control Flash MCUs
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
Part Number:
Description:
Z8 Encore-R Motor Control Series
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
Part Number:
Description:
Z8 MCU MICROCONTROLLERS
Manufacturer:
ZILOG [Zilog, Inc.]
Datasheet:
Part Number:
Description:
Z8 Encore / Microcontrollers with Flash Memory and 10 Bit A/D Converter
Manufacturer:
Zilog
Datasheet:
Part Number:
Description:
Z8 MCU MICROCONTROLLERS
Manufacturer:
Zilog.
Datasheet:
Part Number:
Description:
Ez80f91 Mini Enet Module
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Z90233, Z90234, And Z90231 Ezvision 200 Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Digital Television Controllers
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
Television Controllers
Manufacturer:
ZiLOG Semiconductor
Datasheet:
Part Number:
Description:
40-pin Low-cost Digital Television Controller
Manufacturer:
ZiLOG Semiconductor
Datasheet: