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TLC320AD55CDW Datasheet(PDF) 25 Page - Texas Instruments |
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TLC320AD55CDW Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 41 page  3–7 3.5 Phone Mode Control This function is provided for applications that need hardware control and monitor of external events. By allowing the device to drive two FLAG terminals (set through the control 2 register), the host digital signal processor (DSP) is capable of system control through the same serial port connection to the device. Along with this control is the capability for monitoring the value of the ALT DATA terminal during a secondary communication cycle. One application for this function is in monitoring ring detect or offhook detect from a phone answering system. The two FLAG terminals allow response to these incoming control signals. Figure 3– 8 shows the timing associated with this operating mode. DOUT (Secondary Write) Primary Secondary Primary Secondary Primary ALT DATA ALT DATA DIN Set FLAG 0 = FLAG 1 = 0 FLAG 0, FLAG 1 DOUT (Secondary Read) ALT DATA Register Data 8 SCLKs 1 SCLK MAX Set FLAG 0 = FLAG 1 = 1 FS Figure 3– 8. Phone Mode Timing |
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