TMS320LC2401AVFS datasheet(58/134 Pages) TI

58 / 134 page

TMS320LF2407A,TMS320LF2406A,TMS320LF2403A,TMS320LF2402A

TMS320LC2406A,TMS320LC2404A,TMS320LC2403A,TMS320LC2402A

DSP CONTROLLERS

SPRS145K − JULY 2000 − REVISED AUGUST 2005

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

PLL-based clock module (continued)

XTAL2

XTAL1/CLKIN

PLL

XTAL

OSC

CLKOUT

Fin

3-bit

PLL Select

(SCSR1.[11:9])

PLLF

RESONATOR/

CRYSTAL

PLLF2

Cb1

Cb2

Figure 16. PLL Clock Module Block Diagram

Table 9. PLL Clock Selection Through Bits (11−9) in SCSR1 Register

CLK PS2

CLK PS1

CLK PS0

CLKOUT

× Fin

1.33

× Fin

0.8

× Fin

0.66

× Fin

0.57

× Fin

0.5

× Fin

Default multiplication factor after reset is (1,1,1), i.e., 0.5

× Fin.

NOTE:

The bootloader sets the PLL to x2 or x4 option. If the bootloader is used, the value of CLKIN used

should not force CLKOUT to exceed the maximum rated device speed. See the “Boot ROM” section

for more details.

external reference crystal clock option

The internal oscillator is enabled by connecting a crystal across the XTAL1/CLKIN and XTAL2 pins as shown

in Figure 17a. The crystal should be in fundamental operation and parallel resonant, with an effective series

resistance of 30

Ω −150 Ω and draws no more than 1 mW; it should be specified at a load capacitance of 20 pF.

NOTE: Lx240xA crystal biasing needs an external 1 M

Ω resistor across X1 and X2 pins for reliable operation. See the TMS320LF2407A,

LF2406A, LF2403A, LF2402A DSP Controllers Silicon Errata (literature number SPRZ002) or the TMS320LC2406A, TMS320LC2404A,

TMS320LC2402A DSP Controllers Silicon Errata (literature number SPRZ185) for details on this requirement.

external reference oscillator clock option

The internal oscillator is disabled by connecting a clock signal to XTAL1/CLKIN and leaving the XTAL2 input

pin unconnected as shown in part b of Figure 17.

TMS320LC2401AVFS датащи(PDF) 58 Page - Texas Instruments

TMS320LC2401AVFS датащи(HTML) 58 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL