參數(shù)資料
型號(hào): MC908EY16AKFJE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
封裝: 7 X 7 MM, 1.40 MM HEIGHT, 0.80 MM HEIGHT, MS-026BBA, LQFP-32
文件頁(yè)數(shù): 169/292頁(yè)
文件大?。?/td> 3797K
代理商: MC908EY16AKFJE
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Development Support
MC68HC908EY16A MC68HC908EY8A Data Sheet, Rev. 1
250
Freescale Semiconductor
Upon power-on reset, if the received bytes of the security code do not match the data at locations
$FFF6–$FFFD, the host fails to bypass the security feature. The MCU remains in monitor mode, but
reading a FLASH location returns an invalid value and trying to execute code from FLASH causes an
illegal address reset. After receiving the eight security bytes from the host, the MCU transmits a break
character, signifying that it is ready to receive a command.
NOTE
The MCU does not transmit a break character until after the host sends the
eight security bytes.
To determine whether the security code entered is correct, check to see if bit 6 of RAM address $40 is
set. If it is, then the correct security code has been entered and FLASH can be accessed.
If the security sequence fails, the device should be reset by a power-on reset and brought up in monitor
mode to attempt another entry. After failing the security sequence, the FLASH module can also be mass
erased by executing an erase routine that was downloaded into internal RAM. The mass erase operation
clears the security code locations so that all eight security bytes become $FF (blank).
19.3.3 Extended Security
In addition to the above security, a more secure feature called extended security is implemented in the
MCU to further protect FLASH contents. Once this extended security is enabled, the MCU does not allow
any user to enter the monitor mode even when all 8 security bytes are matched correctly. The extended
security feature can be enabled by programming address $FDFF located in the user FLASH memory with
data $00.
To unlock the extended security feature, the MCU must enter the monitor mode by failing the 8 byte
security check. Then the FLASH must be mass-erased. This unlock process will erase the FLASH
contents completely.
NOTE
To avoid enabling the extended security unintentionally, the user must
make sure that the user software does not contain data $00 at address
$FDFF.
19.4 Routines Supported in ROM
In the ROM, five routines are supported. Because the ROM has a jump table, the user does not call the
routines with direct addresses. Therefore, the calling addresses will not change—even when the ROM
code is updated in the future.
This section introduces each routine briefly. Details are discussed in later sections.
GetByte — This routine is used to receive a byte serially on the general-purpose I/O PTA0. The
receiving baud rate is the same as the baud rate used in monitor mode. In the GetByte routine, the
GetBit routine is called to generate baud rates.
PutByte — This routine is used to send a byte serially on the general-purpose I/O PTA0. The
sending baud rate is the same as the baud rate specified in monitor mode.
Verify — This routine is used to perform one of two options. Using the send-out option, this routine
reads FLASH locations and sends the data out serially on the general-purpose I/O PTA0. Using
the compare option, this routine compares the FLASH data against data in a specific RAM location,
which is referred to as a DATA array. The DATA array locations and the variable locations required
for this routine are at fixed memory addresses.
相關(guān)PDF資料
PDF描述
MC908EY16AMFJE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
MC908EY16ACFJER 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
MC908EY16ACFJE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
MC908GR16VFJ 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PQFP32
MC908GR16CFJ 8-BIT, FLASH, 8.2 MHz, MICROCONTROLLER, PQFP32
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC908EY16AMFJE 功能描述:8位微控制器 -MCU AUTO 908EY16A MOS9 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC908EY16AVFJE 功能描述:8位微控制器 -MCU AUTO 908EY16A MOS9 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC908EY16CFAE 功能描述:8位微控制器 -MCU 8BIT MCU 16K FLASH RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC908EY16CFAER 功能描述:8位微控制器 -MCU 8BIT MCU 16K FLASH RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MC908EY16MFAE 功能描述:8位微控制器 -MCU 8BIT MCU 16K FLASH RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT