Final answer:
Timer1 can count to the maximum value that an 8-bit timer can reach, which is 255 cycles, or up to 65,535 cycles for a 16-bit timer, assuming no prescaler is used. The exact maximum count value requires knowing the bit size of the timer.
Step-by-step explanation:
The question "Timer1 without prescaler can count from 0 to ___ cycles." pertains to microcontrollers and timers in the context of computer engineering or embedded systems. A timer in a microcontroller is a hardware component that can count clock cycles, generate precise delays, and measure time intervals. Without a prescaler, Timer1's maximum count typically depends on the number of bits it has. For example, an 8-bit timer can count up to 28 - 1 which is 255 cycles, while a 16-bit timer can count from 0 to 216 - 1 which is 65,535 cycles. Therefore, to provide a precise answer, one needs to know the bit-size of Timer1 of the specific microcontroller being discussed.