By R E Vears
A part of a chain designed for college students looking technician or identical skills throughout the classes of the enterprise and Technician Council (BTEC), the Scottish Technical schooling Council, Australian Technical and extra schooling Departments and the East and West African Examinations Council, this textbook of labored difficulties offers assurance of the BTEC unit in microelectronic platforms, syllabus U86/333, dealing mostly with subject matters final after the extraction of a unmarried unit at N11 point. The ebook concentrates at the 6502, Z80 and 6500 microprocessors
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Extra resources for Microelectronic Systems N3 Checkbook
On Since current must flow in either the heater or the motor (or both) whenever either St or S2 is closed, a simple polling routine of the type shown in Fig. 8 may be used. A suitable 6502 machine code routine to poll the switches and to operate the heater and the motor is as follows: / \ BIT $1700 ^yes |no }' turn on 1 motor 1 turn off motor < \ i Λ -5^ yes Tno turn off heater 1 i>+— 48 \f turn on heater Fig. 8 PAD PADD 0200 0202 0205 0206 0208 020B 020E 0210 0212 0214 0216 0218 021A 021C 021E Fig.
Keep polling if Z = 0, or service the peripheral device if Z = 1. This action is shown in Fig. 16. Pmbkm 9 At* industrial process which incorporates a heating element and an electric motor is controlled by a ZM based microcomputer with a 1M HO, The motor and heater circuits are connected to bit 0 and bit i, respectively, of port A of the ΊΜ H O , and are controlled by switches Si and $ a which are connected to bit 6 and bit 1 of the same port, as shown in Fig. 17. Write a 2M machine code program, starting at address 0C90i6> which polls Sj and S2 and controls the heater and motor in the following manner; St open Sj closed S2 open $2 closed : : : : heater heater motor motor The total number of objects which pass this sensor m> counted by the microcomputer, ma am displayed, in binary, on elfht LED» which are connected to port Ä of the PIO* This arrangement & illustrated m Fi$> 19, Write a £80 machine oode program to poll S a , an
The total number of objects which pass this sensor m> counted by the microcomputer, ma am displayed, in binary, on elfht LED» which are connected to port Ä of the PIO* This arrangement & illustrated m Fi$> 19, Write a £80 machine oode program to poll S a , an