Operation In Top Continuous Output Mode (Without Correction Function) - Mitsubishi Electric M32R Series User Manual

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

MULTIJUNCTION TIMERS

10.3 TOP (Output-related 16-bit Timer)

10.3.11 Operation in TOP Continuous Output Mode (Without Correction Function)

(1) Outline of TOP continuous output mode

In continuous output mode, the timer counts down clock pulses starting from the set value of the

counter and when the counter underflows, reloads it with the reload register value. Thereafter,

this operation is repeated each time the counter underflows, thus generating consecutive pulses

whose waveform is inverted in width of (reload register set value + 1).

When after setting the counter and reload register, the timer is enabled (by writing to the enable

bit in software or by external input), it starts counting down from the counter's set value

synchronously with the count clock and when the minimum count is reached, generates an

underflow. This underflow causes the counter to be reloaded with the content of the reload

underflow occurs. To stop the counter, disable count by writing to the enable bit in software.

The F/F output waveform in continuous output mode is inverted (F/F output levels change from

low to high, or vice versa) at startup and upon underflow, generating consecutive pulses until the

timer stops counting. Also, an interrupt can be generated each time the counter underflows.