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ADC0804LCWM 数据表(PDF) 39 Page - Texas Instruments |
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ADC0804LCWM 数据表(HTML) 39 Page - Texas Instruments |
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39 / 48 page  ADC0801, ADC0802 ADC0803, ADC0804, ADC0805 www.ti.com SNOSBI1B – NOVEMBER 2009 – REVISED FEBRUARY 2013 The key to decoding circuitry is the DM74LS373, 8-bit D type flip-flop. When the Z-80 acknowledges the interrupt, the program is vectored to a data input Z-80 subroutine. This subroutine will read a peripheral status word from the DM74LS373 which contains the logic state of the INTR outputs of all the converters. Each converter which initiates an interrupt will place a logic "0" in a unique bit position in the status word and the subroutine will determine the identity of the converter and execute a data read. An identifier word (which indicates which A/D the data came from) is stored in the next sequential memory location above the location of the data so the program can keep track of the identity of the data entered. Figure 64. Flow Chart for Auto-Zero Routine Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Links: ADC0801, ADC0802 ADC0803, ADC0804, ADC0805 |
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