參數(shù)資料
型號(hào)： TMS470R1B768PGEQR
廠商： TEXAS INSTRUMENTS INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, FLASH, 60 MHz, RISC MICROCONTROLLER, PQFP144
封裝： PLASTIC, LQFP-144
文件頁(yè)數(shù)： 21/49頁(yè)
文件大?。?/td> 552K
代理商： TMS470R1B768PGEQR
External Reference Resonator/Crystal Oscillator Clock Option
External
Clock Signal
(toggling 0-1.8 V)
OSCOUT
OSCIN
Crystal
OSCOUT
OSCIN
(a)
(b)
C1(A)
C2(A)
SPNS108B – AUGUST 2005 – REVISED MAY 2008 ......................................................................................................................................................... www.ti.com
The oscillator is enabled by connecting the appropriate fundamental 4–20 MHz resonator/crystal and load
capacitors across the external OSCIN and OSCOUT pins as shown in Figure 5a. The oscillator is a single-stage
inverter held in bias by an integrated bias resistor. This resistor is disabled during leakage test measurement and
HALT mode. TI strongly encourages each customer to submit samples of the device to the
resonator/crystal vendors for validation. The vendors are equipped to determine what load capacitors will
best tune their resonator/crystal to the microcontroller device for optimum start-up and operation over
temperature/voltage extremes.
An external oscillator source can be used by connecting a 1.8-V clock signal to the OSCIN pin and leaving the
OSCOUT pin unconnected (open) as shown in Figure 5b.
A.
The values of C1 and C2 should be provided by the resonator/crystal vendor.
Figure 5. Crystal/Clock Connection
28
Copyright 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): TMS470R1B768
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