Freescale Semiconductor EETX4K, Block Guide Functional Description, Eeprom Command Operations

Page 25

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Block Guide — S12EETX4KV0 V00.04

Section 4 Functional Description

4.1 EEPROM Command Operations

Write and read operations are both used for the program, erase, erase verify, sector erase abort, and sector modify algorithms described in this section. The program, erase, and sector modify algorithms are controlled by a state machine whose timebase, EECLK, is derived from the oscillator clock via a programmable divider. The command register as well as the associated address and data registers operate as a buffer and a register (2-stage FIFO) so that a second command along with the necessary data and address can be stored to the buffer while the first command is still in progress. Buffer empty as well as command completion are signalled by flags in the EEPROM status register with interrupts generated, if enabled.

The next sections describe:

1.How to write the ECLKDIV register.

2.Command write sequences to program, erase, erase verify, sector erase abort, and sector modify operations on the EEPROM memory.

3.Valid EEPROM commands.

4.Effects resulting from illegal EEPROM command write sequences or aborting EEPROM operations.

4.1.1 Writing the ECLKDIV Register

Prior to issuing any EEPROM command after a reset, the user is required to write the ECLKDIV register to divide the oscillator clock down to within the 150kHz to 200kHz range. Since the program and erase timings are also a function of the bus clock, the ECLKDIV determination must take this information into account.

If we define:

•ECLK as the clock of the EEPROM timing control block,

•Tbus as the period of the bus clock,

•INT(x) as taking the integer part of x (e.g. INT(4.323)=4),

then ECLKDIV register bits PRDIV8 and EDIV[5:0] are to be set as described in Figure 4-1.

For example, if the oscillator clock frequency is 950kHz and the bus clock frequency is 10MHz, ECLKDIV bits EDIV[5:0] should be set to "4" (000100) and bit PRDIV8 set to "0". The resulting EECLK frequency is then 190kHz. As a result, the EEPROM program and erase algorithm timings are increased over the optimum target by:

(200 –190) ⁄ 200 × 100 = 5%

If the oscillator clock frequency is 16MHz and the bus clock frequency is 40MHz, ECLKDIV bits EDIV[5:0] should be set to "50" (110010) and bit PRDIV8 set to "1". The resulting EECLK frequency is

25

For More Information On This Product,

Go to: www.freescale.com

Page 24 Page 26
Image 25
Page 24 Page 26
Contents Original Release Date 7 JUL Revised 30 OCT Motorola, Inc Freescale Semiconductor, IncRevision History Table of Contents Freescale Semiconductor, Inc List of Figures Freescale Semiconductor, Inc List of Tables Freescale Semiconductor, Inc Freescale Semiconductor, Inc Freescale Semiconductor, Inc Introduction FeaturesOverview Modes of OperationInterface Block DiagramClock DividerExternal Signal Description Module Memory Map Memory Map and RegistersEeprom Configuration Field Eeprom Memory Map Eeprom Register Map Address Register Name Normal Mode Offset AccessEclkdiv Eeprom Clock Divider Register Register DescriptionsRESERVED2 Ecnfg Eeprom Configuration RegisterEeprom Protection Register Eprot Eprot Eeprom Protection RegisterEeprom Protection Address Range Estat Eeprom Status RegisterEcmd Eeprom Command Register Valid Eeprom Command List Eeprom Command Register EcmdEdata Eeprom Data Registers Eaddr Eeprom Address Registers13 Eeprom Data Low Register Edatalo Functional Description Eeprom Command OperationsWriting the Eclkdiv Register 200 -182 ⁄ 200 × 100 = 9% Determination Procedure for PRDIV8 and Ediv Bits Eeprom Commands Command Write SequenceEeprom Command Description Sector Erase Verify CommandExample Erase Verify Command Flow Program Command Freescale Semiconductor, Inc Example Program Command Flow Sector Erase Command Freescale Semiconductor, Inc Example Sector Erase Command Flow Mass Erase Command Example Mass Erase Command Flow Sector Erase Abort Command Freescale Semiconductor, Inc Ccif Illegal Eeprom Operations Example Sector Modify Command Flow3.5 Stop Mode Wait ModeBackground Debug Mode Unsecuring the MCU in Special Single Chip Mode via the BDMEeprom Reset Sequence ResetsReset While Eeprom Command Active InterruptsEeprom Interrupt Implementation Index Freescale Semiconductor, Inc Block Guide End Sheet Final Pages

Block Guide, EETX4K specifications

Freescale Semiconductor, a global leader in embedded processing solutions, introduced the EETX4K, a revolutionary embedded processor designed to meet the growing demands of industrial applications. The EETX4K processor is specifically engineered for high-performance, low-power systems, offering an ideal balance between performance and power consumption.

One of the main features of the EETX4K is its high level of integration. This processor houses a powerful ARM Cortex-A9 core, which allows for efficient processing capabilities while maintaining a compact architecture. This ensures that the EETX4K can operate seamlessly in various applications, including automotive systems, industrial automation, and consumer electronics.

A standout characteristic of the EETX4K is its extensive connectivity options. It supports a range of communication interfaces, such as Ethernet, SPI, I2C, UART, and USB, enabling flexible integration into various networked environments. The processor is equipped with hardware Ethernet support for Real-Time Ethernet protocols, ensuring reliable and deterministic data transfer, which is crucial for time-sensitive applications.

In addition to its connectivity features, the EETX4K supports advanced graphical processing capabilities. With integrated 3D Graphics and Video Processing Units, it can handle demanding multimedia applications, making it suitable for user interfaces in industrial machines and smart devices. This makes the EETX4K an optimal choice for applications requiring rich graphics and advanced visualization.

Another important technological aspect of the EETX4K is its robust security features. It is designed with security in mind, incorporating hardware support for secure boot and secure data storage. This ensures that sensitive information is protected against potential threats and vulnerabilities, a critical requirement in today's interconnected world.

Furthermore, the EETX4K is optimized for energy efficiency, allowing for extended operational periods in battery-powered or energy-constrained environments. With its low thermal design power (TDP), it minimizes heat generation, ensuring that systems remain reliable and efficient under various operating conditions.

In summary, the Freescale Semiconductor EETX4K is a versatile embedded processor that combines high performance, comprehensive connectivity, advanced graphics capabilities, robust security features, and energy efficiency. These attributes make it an ideal solution for a wide range of applications, paving the way for innovation across multiple industries.
Top Page Image Contents