32186 datasheet(408/1032 Pages) RENESAS

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

MULTIJUNCTION TIMERS

10-112

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

10.4.10 Operation in TIO Noise Processing Input Mode

In noise processing input mode, the timer is used to detect that the input signal remained in the same state for

over a predetermined time.

In noise processing input mode, a "H" or "L" level on external input activates the counter and if the input signal

remains in the same state for over a predetermined time before the counter underflows, the counter generates

an interrupt request before stopping. If the valid-level signal being applied turns to an invalid level before the

counter underflows, the counter temporarily stops counting and at the next cycle after a valid-level signal is

entered again, the counter is reloaded with the value that "reload register -1" and restarts counting. The effec-

tive count width 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 enable bit.

Furthermore, it is possible to generate an interrupt request and a DMA transfer request (for only the TIO8 and

TIO9) upon underflow of the counter.

Figure 10.4.8 Typical Operation in Noise Processing Input Mode

H'FFFF

H'0000

H'A000

DMA transfer request (Note 1)

Note 1: Only TIO8 and TIO9 can be generated.

Note 2: The value that "reload register - 1" is reloaded.

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

DMA transfer request

due to underflow

Reload 0 register

External input

(noise processing)

Effective signal

width

Invalid

Disabled by underflow

Count clock

Counter

Enabled

(by writing to

the enable bit)

TIO interrupt request

Enable bit

Invalid

TIO interrupt request

due to underflow

Undefined

value

(Note 2)

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