參數(shù)資料
型號： SC9RS08KA1J3CDB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PDSO6
封裝： 3 X 3 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, DFN-6
文件頁數(shù)： 60/134頁
文件大?。?/td> 3114K
代理商： SC9RS08KA1J3CDB
Chapter 4 Memory
SC9RS08KA2 Series Data Sheet, Rev. 1
Freescale Semiconductor
31
3. Write any data to any Flash location, via the high page accessing window $00C0–$00FF. (Prior to
the data writing operation, the PAGESEL register must be configured correctly to map the high
page accessing window to the any Flash locations).
4. Wait for a time, tnvs.
5. Set the HVEN bit.
6. Wait for a time tme.
7. Clear the MASS bit.
8. Wait for a time, tnvh1.
9. Clear the HVEN bit.
10. After time, trcv, the memory can be accessed in read mode again.
11. Remove external VPP.
NOTE
Flash memory cannot be programmed or erased by software code executed
from Flash locations. To program or erase Flash, commands must be
executed from RAM or BDC commands. User code should not enter wait or
stop during an erase or program sequence.
These operations must be performed in the order shown, but other unrelated
operations may occur between the steps.
4.6.4
Security
The SC9RS08KA2 Series includes circuitry to help prevent unauthorized access to the contents of Flash
memory. When security is engaged, Flash is considered a secure resource. The RAM, direct-page registers,
and background debug controller are considered unsecured resources. Attempts to access a secure memory
location through the background debug interface, or whenever BKGDPE is set, are blocked (reads return
all 0s).
Security is engaged or disengaged based on the state of a nonvolatile register bit (SECD) in the FOPT
register. During reset, the contents of the nonvolatile location NVOPT are copied from Flash into the
working FOPT register in high-page register space. A user engages security by programming the NVOPT
location, which can be done at the same time the Flash memory is programmed. Notice the erased state
(SECD = 1) makes the MCU unsecure. When SECD in NVOPT is programmed (SECD = 0), next time
the device is reset via POR, internal reset, or external reset, security is engaged. In order to disengage
security, mass erase must be performed via BDM commands and followed by any reset.
The separate background debug controller can still be used for registers and RAM access. Flash mass erase
is possible by writing to the Flash control register that follows the Flash mass erase procedure listed in
Security can always be disengaged through the background debug interface by following these steps:
1. Mass erase Flash via background BDM commands or RAM loaded program.
2. Perform reset and the device will boot up with security disengaged.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC9RS08KA1J3CPC 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:RS08 Microcontrollers
SC9RS08KA1J3CSC 制造商:Freescale Semiconductor 功能描述:8-BIT RS08 CISC 1KB FLASH 2.5V/3.3V/5V 8-PIN SOIC N RAIL - Rail/Tube 制造商:Freescale Semiconductor 功能描述:1K FLASH W/ ACMP 62 RAM
SC9RS08KA2 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:RS08 Microcontrollers
SC9RS08KA2J3CDB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:RS08 Microcontrollers
SC9RS08KA2J3CPC 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:RS08 Microcontrollers
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