參數(shù)資料
型號(hào): MC56F8355VFGE
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 數(shù)字信號(hào)處理
英文描述: 4-BIT, 120 MHz, OTHER DSP, PQFP128
封裝: ROHS COMPLIANT, PLASTIC, LQFP-128
文件頁數(shù): 29/172頁
文件大?。?/td> 844K
代理商: MC56F8355VFGE
56F8355 Technical Data, Rev. 17
124
Freescale Semiconductor
Preliminary
The value of the JTAG FM_CLKDIV[6:0] will replace the value of the FM register FMCLKD that divides
down the system clock for timed events, as illustrated in Figure 7-1. FM_CLKDIV[6] will map to the
PRDIV8 bit, and FM_CLKDIV[5:0] will map to the DIV[5:0] bits. The combination of PRDIV8 and DIV
must divide the FM input clock down to a frequency of 150kHz-200kHz. The “Writing the FMCLKD
Register” section in the Flash Memory chapter of the 56F8300 Peripheral User Manual gives specific
equations for calculating the correct values.
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
JTAG
FMCLKD
DIVIDER
7
FM_CLKDIV
FM_ERASE
Flash Memory
clock
input
SYS_CLK
2
<
(DIV + 1)
150[kHz]
200[kHz]
SYS_CLK
(2)
)
(
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