Electronic Components Datasheet Search |
|
DS87000 Datasheet(PDF) 6 Page - Dallas Semiconductor |
|
DS87000 Datasheet(HTML) 6 Page - Dallas Semiconductor |
6 / 10 page DS87000 6 of 10 There is no lock. However, encryption will be performed as usual. This level is the erased default state of the device. The programmer does not program this level. • Level 2: This level prevents MOVC instructions in external memory from reading program bytes in internal memory. \EA is sampled and latched on reset. No further programming of EPROM will be allowed after this level is set. • Level 3: This is the same as level 2 plus it does not allow further verify or read operations. It also prevents MOVX instructions in external memory from reading SRAM (MOVX) in internal memory. • Level 4: This is the same as level 3 plus it does not allow execution from external memory. Note: The lock bits and the encryption vector are distinctly separate security measures. The status of one has no effect on the other, and each may be used or not used independently of the other. Program via Script Program the device using a pre-defined script (see Script Definition Menu below) to step through a series of operations. Status This command causes the PC software to read the programmer and to update the information displayed on the Status line of the menu screen. The Status line contains four parameters: Version, COM, Signature, and Option Byte. The Version indicates the revision level of the system software and the programmer’s firmware. It is displayed as PC_VERSION/FIRMWARE_VERSION. The COM parameter indicates the currently selected PC COM port. Signature displays the three signature bytes read from the device during its last access (see data sheet for description). The Option Byte displays the option byte read from the device during its last access (see data sheet for description). Script Definition Menu This menu allows the user to define a script that will cause a specific series of operations to be performed when it is executed. The script is initiated by executing a "Program Via Script" command from the PC hosted system software or by pressing the programmer's Program button. Pressing the program button always executes the script currently stored in the programmer’s non-volatile memory. The programmer’s non- volatile memory is updated whenever the user confirms a modification to the script definition from the menu software. A script contains individual programmer commands and associated options that are executed in sequence, one at a time. Available script commands are identically the commands available under the device menu (that is, blank check, read, verify, iblank check, program, serialize, option byte, write encryption, and write lock bits). The serialize command has no options when executed from within a script. For this function to work properly here, its options must be defined using the serialize menu of the system software. Once set, the serialize options are also stored in the non-volatile memory of the programmer. When the Script Definition menu is selected, the user is presented with two main windows. The Option Selection window contains a list of available commands, and the Script Definition window contains the |
Similar Part No. - DS87000 |
|
Similar Description - DS87000 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |