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CDP1871ACQ Datasheet(PDF) 2 Page - Intersil Corporation |
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CDP1871ACQ Datasheet(HTML) 2 Page - Intersil Corporation |
2 / 10 page 4-67 CDP1871A, CDP1871AC FIGURE 1. TYPICAL CDP1800 SERIES MICROPROCESSOR SYSTEM USING THE CDP1871A FIGURE 2. CDP1871A BLOCK DIAGRAM 0.1 µF 36 VDD 100K 40 DEBOUNCE CS1, CS2, CS3 CS4 TPB SHIFT 23 24 21 34 CONTROL ALPHA 39 CONTROL SHIFT 38 BUS0-BUS7 CONTROL MRD D11 D1 ALPHA LOCK NORMAL VDD TPB N0-N2 37 BUS0-BUS7 CDP1800-SERIES CPU CDP1871A S1 12 S2 13 S3 14 S4 15 S5 16 S6 17 S7 18 S8 19 8 BIT DATA BUS 11 UP TO 11 SETS OF 8 SWITCHES EACH 1 32 25 CS1 CS2 CS3 21 22 23 24 34 CS4 TPB CS CONTROL LOGIC KEY DETECT 36 DEBOUNCE CX RX VDD RN F/F 33 DA 35 RPT STATUS LATCHES KEY DOWN DETECT 1 OF 8 MUX RPD RPD FROM KEY BOARD 12 19 SENSE LINES 1 11 TO KEY BOARD DRIVE LINES DI DII 37 ALPHA DECODER/ DRIVERS II LATCH 39 SHIFT 38 CONTROL RPD RPD THREE-STAGE SCAN COUNTER FIVE-STAGE SCAN COUNTER C1-C3 C4-C8 THREE-STATE OUTPUT BUFFERS BUS ENABLE 25 32 BUS 0 BUS 7 40 20 VDD VSS SCAN CLOCK |
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