Outline Of Each Mode Of Tod - Mitsubishi Electric M32R Series User Manual

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

10.8.2 Outline of Each Mode of TOD

Each mode of TOD is outlined below. For each TOD channel, only one of the following modes can

be selected.

(1) PWM output mode (without correction function)

In PWM output mode, the timer uses two reload registers to generate a waveform with a given

When after setting the initial values in reload 0 and reload 1 registers, the timer is enabled (by

writing to the enable bit in software or by TID1 underflow/overflow signal), it loads the reload 0

counting down. The first time the counter underflows, the reload 1 register value is loaded into the

counter letting it continue counting. Thereafter, the counter is reloaded with the reload 0 and

reload 1 register values alternately each time an underflow occurs.

The F/F output waveform in PWM output mode is inverted at count startup and upon each

underflow. The timer stops at the same time count is disabled by writing to the enable bit (and not

in synchronism with PWM output period). An interrupt can be generated when the counter

underflows every other time (second time, fourth time, and so on) after being enabled.

(2) Single-shot output mode (without correction function)

In single-shot output mode, the timer generates a pulse in width of (reload 0 register set value +

1) only once and stops without performing any operation.

When after setting the reload 0 register, the timer is enabled (by writing to the enable bit in

software or by TID1 underflow/overflow signal), it loads the content of reload 0 register into the

counter synchronously with the count clock, letting the counter start counting. The counter counts

down clock pulses and stops when it underflows after reaching the minimum count.

The F/F output waveform in single-shot output mode is inverted at startup and upon underflow,

generating a single-shot pulse waveform in width of (reload 0 register set value + 1) only once.

Also, an interrupt can be generated when the counter underflows.

10.8 TOD (Output-related 16-bit Timer)

MULTIJUNCTION TIMERS