參數資料
型號: MC56F8356MFVE
廠商: Freescale Semiconductor
文件頁數: 34/178頁
文件大?。?/td> 0K
描述: IC DSP 16BIT 60MHZ 144-LQFP
標準包裝: 60
系列: 56F8xxx
核心處理器: 56800E
芯體尺寸: 16-位
速度: 60MHz
連通性: CAN,EBI/EMI,SCI,SPI
外圍設備: POR,PWM,溫度傳感器,WDT
輸入/輸出數: 62
程序存儲器容量: 264KB(132K x 16)
程序存儲器類型: 閃存
RAM 容量: 10K x 16
電壓 - 電源 (Vcc/Vdd): 2.25 V ~ 3.6 V
數據轉換器: A/D 16x12b
振蕩器型: 外部
工作溫度: -40°C ~ 125°C
封裝/外殼: 144-LQFP
包裝: 托盤
配用: MC56F8367EVME-ND - EVAL BOARD FOR MC56F83X
Flash Access Blocking Mechanisms
56F8356 Technical Data, Rev. 13
Freescale Semiconductor
129
Preliminary
Figure 7-1 JTAG to FM Connection for Lockout Recovery
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.
SYS_CLK
JTAG
FMCLKD
DIVIDER
7
2
FM_CLKDIV
FM_ERASE
Flash Memory
clock
input
SYS_CLK
(2)
)
(
<
(DIV + 1)
150[kHz]
200[kHz]
SYS_CLK
(2)(8)
)
(
<
(DIV + 1)
150[kHz]
200[kHz]
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