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TMS570LS3137 数据表(PDF) 59 Page - Texas Instruments |
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TMS570LS3137 数据表(HTML) 59 Page - Texas Instruments |
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59 / 159 page  OSCIN OSCOUT C1 (see Note A) C2 Crystal (a) OSCIN OSCOUT (b) External (toggling 0-3.3V) Clock Signal Note A: The values of C1 and C2 should be provided by the resonator/crystal vendor. Kelvin_GND Note B: Kelvin_GND should not be connected to any other GND. (see Note B) TMS570LS3137 www.ti.com SPNS162. – SEPTEMBER 2011 4.6 Clocks 4.6.1 Clock Sources The table below lists the available clock sources on the device. Each of the clock sources can be enabled or disabled using the CSDISx registers in the system module. The clock source number in the table corresponds to the control bit in the CSDISx register for that clock source. The table also shows the default state of each clock source. Table 4-8. Available Clock Sources Clock Name Description Default State Source # 0 OSCIN Main Oscillator Enabled 1 PLL1 Output From PLL1 Disabled 2 Reserved Reserved Disabled 3 EXTCLKIN1 External Clock Input #1 Disabled 4 CLK80K Low Frequency Output of Internal Reference Oscillator Enabled High Frequency Output of Internal Reference 5 CLK10M Enabled Oscillator 6 PLL2 Output From PLL2 Disabled 7 EXTCLKIN2 External Clock Input #2 Disabled 4.6.1.1 Main Oscillator The oscillator is enabled by connecting the appropriate fundamental resonator/crystal and load capacitors across the external OSCIN and OSCOUT pins as shown in Figure 4-4. The oscillator is a single stage inverter held in bias by an integrated bias resistor. This resistor is disabled during leakage test measurement and low power modes. 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 3.3V clock signal to the OSCIN pin and leaving the OSCOUT pin unconnected (open) as shown in the figure below. Figure 4-4. Recommended Crystal/Clock Connection Copyright © 2011, Texas Instruments Incorporated System Information and Electrical Specifications 59 Submit Documentation Feedback focus.ti.com: TMS570LS3137 |
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