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Which is the operation for mode 2?(a) 13-bit timer mode, 8-bit timer/counter THx and TLx as 5-bit prescalar(b) 16-bit timer mode, 16-bit timer/counter THx and TLx are cascaded, no prescalar(c) 8-bit auto reload mode, 8-bit auto reload time/counter; THx holds a value which is to be reloaded into TLx each time it overflows(d) Spilt timer modeThis question was addressed to me during an interview for a job.This intriguing question comes from Microcontroller (8051- Pin, Registers, Timers) in portion Prototyping Embedded Devices of IOT

Answer»

Correct choice is (C) 8-bit auto reload mode, 8-bit auto reload time/counter; THx holds a VALUE which is to be RELOADED into TLx each time it overflows

Easiest explanation: It is an 8 bit timer that allows only values of 00 to FFH to be loaded into the timer’s register TH. After TH is loaded with 8 bit value, 8051 gives a copy of it to TL.


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