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TMS320F241FN bảng dữ liệu(PDF) 77 Page - Texas Instruments

tên linh kiện TMS320F241FN
Giải thích chi tiết về linh kiện  DSP CONTROLLERS
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TMS320F241FN bảng dữ liệu(HTML) 77 Page - Texas Instruments

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TMS320F243, TMS320F241
DSP CONTROLLERS
SPRS064B – DECEMBER 1997 – REVISED FEBRUARY 1999
77
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
CLOCK CHARACTERISTICS AND TIMINGS
clock options
PARAMETER
PLL multiply-by-4
The ’F243/’F241 devices include an on-chip PLL which is hardwired for multiply-by-4 operation. This requires
the use of a 5-MHz clock input frequency for 20-MHz device operation. This input clock can be provided from
either an external reference crystal or oscillator.
external reference crystal clock option
The internal oscillator is enabled by connecting a crystal across XTAL1/CLKIN and XTAL2 pins as shown in
Figure 20a. The crystal should be in fundamental operation and parallel resonant, with an effective series
resistance of 30
Ω and a power dissipation of 1 mW; it should be specified at a load capacitance of 20 pF.
external reference oscillator clock option
The internal oscillator is disabled by connecting a TTL-level clock signal to XTAL1/CLKIN and leaving the XTAL2
input pin unconnected as shown in Figure 20b.
External
Clock Signal
(toggling 0 – 5 V)
C2
(see Note A)
C1
(see Note A)
Crystal
XTAL2
XTAL1/CLKIN
XTAL1/CLKIN
XTAL2
NC
NOTE A: For the values of C1 and C2, see the crystal manufacturer’s specification.
(a)
(b)
Figure 20. Recommended Crystal / Clock Connection



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