Discussion
Identify the devices given below with their IC numbers :
| (i) USART | (a) 8251 |
| (ii) Micro controller | (b) 8051 |
| (iii) Interrupt controller | (c) 8259 |
| (iv) DMA controller | (d) 8257 |
(i) (ii) (iii) (iv)
Answer: A
The 8251 is the USART, the universal synchronous and asynchronous receiver transmitter, used for serial communication (a). The 8051 is a microcontroller, with a processor, memory and ports in one chip (b). The 8259 is the programmable interrupt controller (c), and the 8257 is the DMA controller (d). So the code is (a), (b), (c), (d), option (A). The other options exchange the numbers, for example giving the 8051 to the USART or the 8257 to the interrupt controller, which is wrong.
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