Question

What is the operation for mode 1?

(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 mode

The question was posed to me in an internship interview.

My doubt is from Microcontroller (8051- Pin, Registers, Timers) in portion Prototyping Embedded Devices of IOT

Answer 1

The correct answer is (b) 16-bit timer mode, 16-bit timer/counter THx and TLx are cascaded, no prescalar

The best explanation: It is a 16-bit timer; therefore it allows value from 0000 to FFFFH to br loaded into the timer’s register TL and TH. After TH and TL are loaded with a 16-bit initial value, the timer must be started.