Datenblatt-Suchmaschine für elektronische Bauteile |
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MC145170-2 Datenblatt(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC145170-2 Datenblatt(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 32 page MC145170-2 Technical Data, Rev. 5 10 Freescale Semiconductor Pin Connections CLK typically switches near 50% of VDD and has a Schmitt-triggered input buffer. Slow CLK rise and fall times are allowed. See the last paragraph of Din for more information. NOTE To guarantee proper operation of the power-on reset (POR) circuit, the CLK pin must be held at the potential of either the VSS or VDD pin during power up. That is, the CLK input should not be floated or toggled while the VDD pin is ramping from 0 to at least 2.7 V. If control of the CLK pin is not practical during power up, the initialization sequence shown in Figure 15 must be used. ENB Active-Low Enable Input (Pin 6) This pin is used to activate the serial interface to allow the transfer of data to/from the device. When ENB is in an inactive high state, shifting is inhibited, Dout is forced to the high-impedance state, and the port is held in the initialized state. To transfer data to the device, ENB (which must start inactive high) is taken low, a serial transfer is made via Din and CLK, and ENB is taken back high. The low-to-high transition on ENB transfers data to the C, N, or R register depending on the data stream length per Table 7. NOTE Transitions on ENB must not be attempted while CLK is high. This puts the device out of synchronization with the microcontroller. Resynchronization occurs when ENB is high and CLK is low. This input is also Schmitt-triggered and switches near 50% of VDD, thereby minimizing the chance of loading erroneous data into the registers. See the last paragraph of Din for more information. Dout Three-State Serial Data Output (Pin 8) Data is transferred out of the 16-1/2-stage shift register through Dout on the high-to-low transition of CLK. This output is a No Connect, unless used in one of the manners discussed below. Dout could be fed back to an MCU/MPU to perform a wrap-around test of serial data. This could be part of a system check conducted at power up to test the integrity of the system's processor, PC board traces, solder joints, etc. The pin could be monitored at an in-line QA test during board manufacturing. Finally, Dout facilitates troubleshooting a system and permits cascading devices. 3.2 Reference Pins OSCin/OSCout Reference Oscillator Input/Output (Pins 1, 2) These pins form a reference oscillator when connected to terminals of an external parallel-resonant crystal. Frequency-setting capacitors of appropriate values as recommended by the crystal supplier are connected |
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Ähnliche Beschreibung - MC145170-2 |
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