参数资料
型号: MC56F8355VFG60
厂商: MOTOROLA INC
元件分类: 数字信号处理
英文描述: 4-BIT, 120 MHz, OTHER DSP, PQFP128
封装: LQFP-128
文件页数: 18/152页
文件大小: 2224K
代理商: MC56F8355VFG60
114
56F8355 Technical Data
Preliminary
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 56F8355 (by asserting external chip reset) to return to
normal unsecured operation.
7.2.4
Product Analysis
The recommended method of unsecuring a programmed 56F8355 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.
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 modify the security bytes.
To insure that a customer does not inadvertently lock himself out of the 56F8355 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.
<
(DIV + 1)
150[kHz]
200[kHz]
SYS_CLK
(2)
)
(
<
(DIV + 1)
150[kHz]
200[kHz]
SYS_CLK
(2)
)
(
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