32186 datasheet(406/1032 Pages) RENESAS

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10.4 TIO (Input/Output-Related 16-Bit Timer)

MULTIJUNCTION TIMERS

10-110

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

10.4.9 Operation in TIO Measure Free-Run/Clear Input Modes

(1) Outline of TIO measure free-run/clear input modes

In measure free-run/clear input modes, the timer is used to measure a duration of time from when the

counter starts counting until when an external capture signal is entered. It is possible to generate an inter-

rupt request upon underflow of the counter or execution of measurement operation and a DMA transfer

request (for only the TIO8 and TIO9) upon underflow of the counter.

After the timer is enabled (by writing to the enable bit in software), the counter starts counting down synchro-

nously with the count clock. When a capture signal is entered from an external device, the counter value at

that point in time is written into a register called the “measure register.”

In measure clear input mode, the counter value is initialized to H’FFFF upon capture, from which the counter

starts counting down again. The counter returns to H’FFFF upon underflow, from which it starts counting down.

In measure free-run input mode, the counter continues counting down even after capture and upon under-

flow, recycles to H’FFFF, from which it starts counting down again.

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

Figure 10.4.6 Typical Operation in Measure Free-Run Input Mode

H'FFFF

H'0000

H'7000

H'9000

H'7000

H'9000

DMA transfer request (Note 1)

Count clock

Counter

TIO interrupt request

Enable bit

Measure register

TIN interrupt request

Undefined

value

Undefined

Note 1: Only TIO8 and TIO9 can be generated.

Note: • This diagram does not show detailed timing information.

Enabled

(by writing to

the enable bit)

Measure event

(capture) occurs

Measure event

(capture)

TIN interrupt request due to

external event input

TIO interrupt request due

to underflow

TIN interrupt request due to

external event input

DMA transfer request due

to underflow

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