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AFE4490RHAR データシート(PDF) 21 Page - Texas Instruments |
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AFE4490RHAR データシート(HTML) 21 Page - Texas Instruments |
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21 / 70 page  8-MHz Crystal Timer Module Diagnostics Module ADC Oscillator Divide- by-2 CLKOUT 4 MHz XIN XOUT AFE4490 www.ti.com SBAS602B – DECEMBER 2012 – REVISED FEBRUARY 2013 CLOCKING AND TIMING SIGNAL GENERATION The crystal oscillator generates a master clock signal using an external 8-MHz crystal. A divide-by-2 block converts the 8-MHz clock to 4 MHz, which is used by the AFE to operate the timer modules, ADC, and diagnostics. The 4-MHz clock is buffered and output from the AFE in order to clock an external microcontroller. The clocking functionality is shown in Figure 31. Figure 31. AFE Clocking TIMER MODULE See Figure 32 for a timing diagram detailing the various timing edges that are programmable using the timer module. The rising and falling edge positions of 11 signals can be controlled. The module uses a single 16-bit counter (running off of the 4-MHz clock) to set the time-base. All timing signals are set with reference to the pulse repetition period (PRP). Therefore, a dedicated compare register compares the 16-bit counter value with the reference value specified in the PRF register. Every time that the 16-bit counter value is equal to the reference value in the PRF register, the counter is reset to '0'. Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 21 Product Folder Links: AFE4490 |
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