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參數(shù)資料
| 型號： | MC56F8345 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 56F8345 16-bit Hybrid Controller |
| 中文描述： | 56F8345 16位混合控制器 |
| 文件頁數(shù)： | 113/148頁 |
| 文件大?。?/td> | 1420K |
| 代理商： | MC56F8345 |
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Flash Access Blocking Mechanisms
56F8345 Technical Data
Preliminary
113
Two examples of FM_CLKDIV calculations follow.
EXAMPLE 1:
If the system clock is the 8MHz crystal frequency because the PLL has not been
set up, the input clock will be below 12.8MHz, so PRDIV8 = FM_CLKDIV[6] = 0. Using the
following equation yields a DIV value of 19 for a clock of 200kHz, and a DIV value of 20 for a
clock of 190kHz. This translates into an FM_CLKDIV[6:0] value of $13 or $14, respectively.
EXAMPLE 2:
In this example, the system clock has been set up with a value of 32MHz, making
the FM input clock 16MHz. Because that is greater than 12.8MHz, PRDIV8 = FM_CLKDIV[6] =
1. Using the following equation yields a DIV value of 9 for a clock of 200kHz, and a DIV value of
10 for a clock of 181kHz. This translates to an FM_CLKDIV[6:0] value of $49 or $4A,
respectively.
Once the LOCKOUT_RECOVERY instruction has been shifted into the instruction register, the
clock divider value must be shifted into the corresponding 7-bit data register. After the data register
has been updated, the user must transition the TAP controller into the RUN-TEST/IDLE state for
the lockout sequence to commence. The controller must remain in this state until the erase
sequence has completed. For details, see the JTAG Section in the
56F8300 Peripheral User
Manual
.
Note:
When the lockout recovery sequence has completed, the user must reset both the JTAG TAP
controller (by asserting TRST) and the 56F8345 (by asserting external chip reset) to return to
normal unsecured operation.
7.2.4
The recommended method of unsecuring a programmed 56F8345 for product analysis of field
failures is via the backdoor key access. The customer would need to supply Motorola with the
backdoor key and the protocol to access the backdoor routine in the Flash. Additionally, the
KEYEN bit that allows backdoor key access must be set.
Product Analysis
An alternative method for performing analysis on a secured hybrid controller would be to
mass-erase and reprogram the Flash with the original code, but to modify the security bytes.
To insure that a customer does not inadvertently lock himself out of the 56F8345 during
programming, it is recommended that he program the backdoor access key first, his application
code second, and the security bytes within the FM configuration field last.
SYS_CLK
(2)
)
(
(DIV + 1)
<
<
150[kHz]
200[kHz]
<
<
(DIV + 1)
150[kHz]
200[kHz]
SYS_CLK
(2)
)
(
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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| MC56F8345MFG60 | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 60MHz 60MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| MC56F8345MFGE | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 60MHz/60MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| MC56F8345VFG60 | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 60MHz 60MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| MC56F8345VFGE | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 16 BIT HYBRID CONTROLLER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| MC56F8346 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
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