29 Figure 6 15 Shows An Input Port With An 8 Key Dip Switch When All Switches Are Off The Microprocessor Reads The Da 1 (24.63 KiB) Viewed 36 times
29 Figure 6 15 Shows An Input Port With An 8 Key Dip Switch When All Switches Are Off The Microprocessor Reads The Da 2 (53.56 KiB) Viewed 36 times
29. Figure 6.15 shows an input port with an 8-key DIP switch. When all switches are off, the microprocessor reads the data FFH. When a switch is turned on (closed), it goes to logic 0 (for all switches ON, the data will be OOH). Write instructions to read the input port and, if all switches are open, set the Zero flag. (Use the instruc- tion CMA to complement the input reading and ORA A to set the Zero flag.)
+5V w D Input Port 07H Data Bus Do Input Enable FIGURE 6.15 DIP Switch Input Port with Address 07H
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