TMP89FS60 datasheet(85/410 Pages) TOSHIBA

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TMP89FS60

RA000

Figure 4-7 Noise Cancel Operation

In SLOW1/2 or SLEEP1 mode, a signal is sampled by the low frequency clock divided by 4. If the same

level is detected twice consecutively, the signal is recognized as a signal.

In IDLE0, SLEEP0 or STOP mode, the noise canceller sampling operation is stopped and an external

interrupts are unavailable. When operation returns to NORMAL1/2, IDLE1/2, SLOW1/2 or SLEEP1

mode, sampling operation restarts.

Note 1: When noise is input consecutively during sampling external interrupt pins, the noise cancel function

does not work properly. Set EINTCRx<INTxNC> according to the cycle of externally input noise.

Note 2: When an external interrupt pin is used as an output port, the input signal to the port is fixed to "L"

when the mode is switched to the output mode, and thus an interrupt request occurs. To use the pin

as an output port, clear the corresponding interrupt enable register to "0" to disable the generation of

interrupt.

Note 3: Interrupt requests may be generated during transition of the operation mode. Before changing the

operation mode, clear the corresponding interrupt enable register to "0" to disable the generation of

interrupt. When the operation mode is changed from NORMAL1/2 or IDLE1/2 to SLOW1/2 or

SLEEP1, wait 12/fs [s] after the operation mode is changed and clear the interrupt latch. And when

the operation mode is changed from SLOW1/2 or SLEEP1 to NORMAL1/2 or IDLE1/2, wait 2/

fcgck+3/fspl [s] after the operation mode is changed and clear the interrupt latch.

4.3.5

External interrupt 5

External interrupt 5 detects the falling edge of the INT5 pin and generates interrupt request signals.

In NORMAL1/2 or IDLE1/2 mode, pulses of less than 1/fcgck are removed as noise and pulses of 2/fcgck or

more are recognized as signals.

In SLOW/SLEEP mode, pulses of less than 4/fs are removed as noise and pulses of 8/fs or more are recog-

nized as signals.

Table 4-5

Noise Canceller Sampling Lock

EINTCR4<INT4NC>

Sampling interval

fcgck

fcgck/22

fcgck/23

fcgck/24

INT4 pin

Signal after noise removal

Noise

Signal

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