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15 Switch/ Jumper Table 1-1: Factory Settings Factory Settings (Jumpers Installed) Function Controlled Activates pull-up/ pull-down resistors on Port 0 digital P7 I/O lines Activates pull-up/ pull-down resistors on Port 1 digital P8 I/O lines Activates pull-up/ pull-down resistors on Port 2 digital P9 I/O lines Activates pull-up/ pull-down resistors on Port 3 digital P10 I/O lines Activates pull-up/ pull-down resistors on Port 4 digital P11 I/O lines Activates pull-up/ pull-down resistors on Port 5 digital P12 I/O lines P13-P18 Not used No jumpers installed P19 P20 P21 Sets the clock and gate sources for the 8254 timer/counter Enables and connects a strobe input to Port 0 through the selected EXT INT (external interrupt) line Enables and connects a strobe input to Port 2 through the selected EXT INT (external interrupt) line Enables and connects a strobe input to Port 4 through the selected EXT INT (external interrupt) line All bits pulled up (jumpers installed between COM & V) All bits pulled up (jumpers installed between COM & V) All bits pulled up (jumpers installed between COM & V) All bits pulled up (jumpers installed between COM & V) All bits pulled up (jumpers installed between COM & V) All bits pulled up (jumpers installed between COM & V) CLK0: OSC; CLK1: OUTT0 CLK2:OOUT1; GATE2:EXTGATE2 (timer/counters cascaded) DISABLE (disabled) DISABLE (disabled) P22 DISABLE (disabled) P23-P25 Not used No jumpers installed S1 Sets the base address 300 hex (768 decimal)

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18 8254 P19 ON-BOARD I/O CONNECTOR P6 TIMER/ COUNTER 0 CLK GATE CLK0 XTAL (8 MHz) +5 V PIN 1 PIN 3 EXT CLK 0 EXT GATE 0 OUT PIN 5 T/C OUT 0 OUT0 CLK1 TIMER/ COUNTER 1 CLK GATE +5 V PIN 7 PIN 9 EXT CLK 1 EXT GATE 1 OUT OUT1 CLK2 PIN 11 T/C OUT 1 TIMER/ COUNTER 2 CLK GATE +5 V PIN 13 PIN 15 EXT CLK 2 EXT GATE 2 OUT PIN 17 T/C OUT 2

19 Base Address Decimal / (Hex) Table 1-2 Base Address Switch Settings, S1 Switch Setting Base Address Decimal / (Hex) Switch Setting / (200) / (300) / (220) / (320) / (240) / (340) / (260) / (360) / (280) / (380) / (2A0) / (3A0) / (2C0) / (3C0) / (2E0) / (3E0) = closed, 1 = open

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24 P EXT INT 1 P EXT INT 2 EXT CLK P4.6 P4.5 P4.4 P4.3 P4.2 P4.1 P4.0 P2.7 P2.6 P P5.6 P5.5 P5.4 P5.3 P5.2 P5.1 P5.0 P3.7 P3.6 P EXT GATE 0 T/C OUT 0 EXT CLK 1 EXT GATE 1 T/C OUT 1 EXT CLK 2 EXT GATE 2 T/C OUT P2.4 P P3.4 P P P P P P P P P P P P P P P P P P P P P P P VOLTS VOLTS 49 50

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27 ADDRESS ADDRESS DECODE 8254 PIT 3 8MHz OSC 9 I/O CONNECTOR 24 INTERRUPT CONTROL PC BUS DATA CONTROL 3X8-BIT BIT PROGRAMMABLE DIGITAL I/O 3X8-BIT BIT PROGRAMMABLE DIGITAL I/O VOLTS BIT PROGRAMMABLE I/O CONNECTOR BIT PROGRAMMABLE I/O CONNECTOR +5 VOLTS

28 8254 P19 ON-BOARD I/O CONNECTOR P6 TIMER/ COUNTER 0 CLK GATE CLK0 XTAL (8 MHz) +5 V PIN 1 PIN 3 EXT CLK 0 EXT GATE 0 OUT PIN 5 T/C OUT 0 OUT0 CLK1 TIMER/ COUNTER 1 CLK GATE +5 V PIN 7 PIN 9 EXT CLK 1 EXT GATE 1 OUT OUT1 CLK2 PIN 11 T/C OUT 1 TIMER/ COUNTER 2 CLK GATE +5 V PIN 13 PIN 15 EXT CLK 2 EXT GATE 2 OUT PIN 17 T/C OUT 2

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32 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

33 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

34 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

35 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

36 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

37 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

38 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

39 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

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45 D7 D6 D5 D4 D3 D2 D1 D0

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49 8254 P19 ON-BOARD I/O CONNECTOR P6 TIMER/ COUNTER 0 CLK GATE CLK0 XTAL (8 MHz) +5 V PIN 1 PIN 3 EXT CLK 0 EXT GATE 0 OUT PIN 5 T/C OUT 0 OUT0 CLK1 TIMER/ COUNTER 1 CLK GATE +5 V PIN 7 PIN 9 EXT CLK 1 EXT GATE 1 OUT OUT1 CLK2 PIN 11 T/C OUT 1 TIMER/ COUNTER 2 CLK GATE +5 V PIN 13 PIN 15 EXT CLK 2 EXT GATE 2 OUT PIN 17 T/C OUT 2

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53 CLOCK DIGITAL INPUT IRQ OUT

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65 P4.7 P4.6 P4.5 P4.4 P4.3 P4.2 P4.1 P4.0 P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P VOLTS EXT INT 1 P5.7 P5.6 P5.5 P5.4 P5.3 P5.2 P5.1 P5.0 P3.7 P3.6 P3.5 P3.4 P3.3 P3.2 P3.1 P3.0 P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P VOLTS EXT INT 2 P2 & P3 Mating Connector Part Numbers Manufacturer Part Number AMP M

66 EXT CLK 0 EXT GATE 0 T/C OUT 0 EXT CLK 1 EXT GATE 1 T/C OUT 1 EXT CLK 2 EXT GATE 2 T/C OUT P6 Mating Connector Part Numbers Manufacturer Part Number AMP

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74 DIO4804 User Settings Base I/O Address: (hex) (decimal)

Topics Introduction to Microprocessors

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