Operation In Tio Noise Processing Input Mode - Mitsubishi Electric M32R Series User Manual

Mitsubishi 32-bit risc single-chip microcomputers

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10.4.10 Operation in TIO Noise Processing Input Mode

In noise processing input mode, the timer detects the status of an input signal that it remained in the

same state for over a predetermined time.

In noise processing input mode, the counter is started by entering a high or low-level signal from an

external device and if the signal remains in the same state for over a predetermined time before the

counter underflows, the counter stops after generating an interrupt. If the valid-level signal being

applied turns to an invalid level before the counter underflows, the counter temporarily stops

counting and when a valid-level signal is entered again, it is reloaded with the initial count and

restarts counting. The valid count value is (reload 0 register set value + 1).

The timer stops at the same time the counter underflows or count is disabled by writing to the

An interrupt can be generated by a counter underflow.

External input

(noise processing)

Reload 0 register

TIO interrupt

Note: This diagram does not show detail timing information.

Figure 10.4.10 Typical Operation in Noise Processing Input Mode

(by writing to enable bit

or by external input)

MULTIJUNCTION TIMERS

10.4 TIO (Input/Output-related 16-bit Timer)

Valid signal width

TIO interrupt by

by underflow