tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 83

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA000
4.3.4 External interrupt 4
4.3.3.3
4.3.4.1
Note: The contents of EINTCRx<INTxLVL> are updated each time an interrupt request signal is generated.
erates interrupt request signals.
Signal after noise removal
External interrupt 4 detects the falling edge, the rising edge, both edges or "H" level of the INT4 pin and gen-
Figure 4-4 Interrupt Request Generation and EINTCRx<INTxLVL>
interval selected at EINTCRx<INTxNC>. If the same level is detected three consecutive times, the signal
is recognized as a signal. If not, the signal is removed as noise.
level is detected twice consecutively, the signal is recognized as a signal.
interrupts are unavailable. When operation returns to NORMAL1/2, IDLE1/2, SLOW1/2 or SLEEP1
mode, sampling operation restarts.
Noise cancel time selection function
Interrupt request signal generating condition detection function
In NORMAL1/2 or IDLE1/2 mode, a signal that has been sampled by fcgck is sampled at the sampling
In SLOW1/2 or SLEEP1 mode, a signal is sampled by the low frequency clock divided by 4. If the same
In IDLE0, SLEEP0 or STOP mode, the noise canceller sampling operation is stopped and an external
Note 1: If noise is input consecutively during sampling of external interrupt pins, the noise cancel function
Note 2: If an external interrupt pin is used as an output port, the input signal to the port is fixed to "L" when the
Note 3: Interrupt requests may be generated during transition of the operation mode. Before changing the
Select an interrupt request signal generating condition at EINTCR4<INT4ES> for external interrupt 4.
does not work properly. Set EINTCRx<INTxNC> according to the cycle of externally input noise.
mode is switched to the output mode, and thus an interrupt request occurs. To use the pin as an out-
put port, clear the corresponding interrupt enable register to "0" to disable the generation of interrupt.
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.
i=1 to 3
INTi pin
Table 4-3 Noise Canceller Sampling Lock
EINTCRx<INTxNC>
Figure 4-5 Noise Cancel Operation
00
01
10
11
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Sampling interval
Signal
fcgck/2
fcgck/2
fcgck/2
fcgck
2
3
4
Noise
TMP89FM42