參數(shù)資料
型號： TMS320E14
廠商： Texas Instruments, Inc.
元件分類： 數(shù)字信號處理
英文描述： DIGITAL SIGNAL PROCESSORS
中文描述： 數(shù)字信號處理器
文件頁數(shù)： 42/123頁
文件大小： 1205K
代理商： TMS320E14
www.ti.com
External Clock Signal
(Toggling 0V
DDIO
)
XCLKIN
X2
NC
X1
External Clock Signal
(Toggling 0V
DD
)
XCLKIN
X2
NC
X1
C
L1
X2
X1
Crystal
C
L2
XCLKIN
TMS320F2808, TMS320F2806
TMS320F2801, UCD9501
Digital Signal Processors
SPRS230F–OCTOBER 2003–REVISED SEPTEMBER 2005
2. A 1.8-V external oscillator can be directly connected to the X1 pin. The X2 pin should be left
unconnected and the XCLKIN pin tied low. The logic-high level in this case should not exceed V
DD
.
The three possible input-clock configurations are shown in
Figure 3-9
through
Figure 3-11
Figure 3-9. Using a 3.3-V External Oscillator
Figure 3-10. Using a 1.8-V External Oscillator
Figure 3-11. Using the Internal Oscillator
3.6.1.1
External Reference Oscillator Clock Option
The typical specifications for the external quartz crystal for a frequency of 20 MHz are listed below:
Fundamental mode, parallel resonant
C
L
(load capacitance) = 12 pF
C
L1
= C
L2
= 24 pF
C
shunt
= 6 pF
ESR range = 30 to 60
TI recommends that customers have the resonator/crystal vendor characterize the operation of their
device with the DSP chip. The resonator/crystal vendor has the equipment and expertise to tune the tank
circuit. The vendor can also advise the customer regarding the proper tank component values that will
produce proper start up and stability over the entire operating range.
3.6.1.2
PLL-Based Clock Module
The 280x devices have an on-chip, PLL-based clock module. This module provides all the necessary
clocking signals for the device, as well as control for low-power mode entry. The PLL has a 4-bit ratio
control PLLCR[DIV] to select different CPU clock rates. The watchdog module should be disabled before
writing to the PLLCR register. It can be re-enabled (if need be) after the PLL module has stabilized, which
takes 131072 OSCCLK cycles.
Functional Overview
42
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