By M A Mustafa
This can be the functions consultant to interfacing microcomputers. It bargains sensible non-mathematical strategies to interfacing difficulties in lots of purposes together with info acquisition and keep watch over. Emphasis is given to the definition of the ambitions of the interface, then evaluating attainable options and generating the simplest interface for each state of affairs.
Dr Mustafa A Mustafa is a senior dressmaker of regulate gear and has written many technical articles and papers as regards to pcs and their software to regulate engineering.
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Additional info for Microcomputer Interfacing and Applications
The designer should ensure that 31 Microcomputer interfacing and applications there will be sufficient time for the execution of the background tasks efficiently, even if all the interrupts are requested at the same time. e. the microcomputer waits for an interrupt to occur before taking a corresponding action. Between interrupts, the microcomputer can either be kept in a standby state or, preferably, employed to provide additional functionality, which makes the system more attractive and easier to use.
The processor only responds to a request from an interrupt if its number is higher than the binary combination of the 3 bits (this is further described in the next section). Interrupts can also be categorized according to the type of signal required for their activation to: • • level-triggered or edge-triggered For example, both the maskable and the non-maskable interrupts of the Zilog Z80 microprocessor are active-low. The former is level-triggered, whereas the latter is edge-triggered. On the other hand, the maskable interrupt-request line in the Intel 8086 is activated by a high-level signal, whereas the non-maskable interrupt is activated by a rising edge.
7 Reducing the reserved addressing area: (a) using 12 gates; (b) using 6 gates. the state of both outputs depends on the state of A2. When A2 is low, X2 is low and X3 is high, and when A2 is high X2 is high and X3 is low. This means that X2 is low when the 16-address lines are represented by 1001 1111 1111 lOxx, which corresponds to addresses 9FF8H to 9FFBH. Similarly, X3 is low for the area corresponding to addresses 1001 1111 1111 llxx, which represents addresses 9FFCH to 9FFFH. Comparison Comparing this solution to Solution 1 reveals that this solution uses fewer gates to reserve the same size of addressing area as Solution 1.
Microcomputer Interfacing and Applications by M A Mustafa