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

Mitsubishi 32-bit risc single-chip microcomputers

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10.7.6 Outline of Each Mode of TID

Each mode of TID is outlined below. TID modes can be selected from the following, only one at a time:

(1) Fixed period count mode

In fixed period count mode, the timer uses a reload register to generate an interrupt at intervals of

(reload register set value + 1).

When after setting the reload register (initial value being indeterminate), the timer is enabled (by

writing to the enable bit in software), it loads the content of the reload register into the counter

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

clockpulses and when it underflows after reaching the minimum count, the counter is reloaded

with the content of the reload register again and continues counting. To stop the counter, disable

count by writing to the enable bit. Also, an interrupt can be generated each time the counter

The valid count value is the (reload register set value + 1).

Reload register

TID0 interrupt

by underflow

Note: This diagram does not show detail timing information.

Figure 10.7.3 Typical Operation in TID Fixed Period Count Mode

by writing to enable bit

synchronized

starting from

reload register

MULTIJUNCTION TIMERS

10.7 TID (Input-related 16-bit Timer)

(first time)

starting from

reload register

(second time)

starting from

reload register