External Interrupts - Philips CEM2100/00 Service Manual

3.7 External Interrupts

The T5CL8 has 5 external interrupt inputs. These inputs are equipped with digital noise reject circuits
(Pulse inputs of less than a certain time are eliminated as noise).
Edge selection is also possible with INT1 to INT3. The
rupt input pin or an input/output port, and is configured as an input port during reset.
Edge selection, noise reject control and
control register (EINTCR).
Source Pin
INT0
INT0
INT1 INT1
INT2 INT2
INT3 INT3
INT5
INT5
Note 1: In NORMAL1/2 or IDLE1/2 mode, if a signal with no noise is input on an external interrupt pin, it takes a maximum of "sig-
nal establishment time + 6/fs[s]" from the input signal's edge to set the interrupt latch.
Note 2: When INT0EN = "0", IL4 is not set even if a falling edge is detected on the
Note 3: When a pin with more than one function is used as an output and a change occurs in data or input/output status, an inter-
rupt request signal is generated in a pseudo manner. In this case, it is necessary to perform appropriate processing such
as disabling the interrupt enable flag.
/P00 pin function selection are performed by the external interrupt
INT0
Enable Conditions Release Edge
IMF EF4 INT0EN=1 Falling edge
Falling edge
IMF EF6 = 1 or
Rising edge
Falling edge
IMF EF8 = 1 or
Rising edge
Falling edge
IMF EF12 = 1 or
Rising edge
IMF EF23 = 1 Falling edge
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/P00 pin can be configured as either an external inter-
INT0
Digital Noise Reject
Pulses of less than 2/fc [s] are eliminated as
noise. Pulses of 7/fc [s] or more are considered
to be signals. In the SLOW or the SLEEP mode,
pulses of less than 1/fs [s] are eliminated as
noise. Pulses of 3.5/fs [s] or more are consid-
ered to be signals.
Pulses of less than 15/fc or 63/fc [s] are elimi-
nated as noise. Pulses of 49/fc or 193/fc [s] or
more are considered to be signals. In the SLOW
or the SLEEP mode, pulses of less than 1/fs [s]
are eliminated as noise. Pulses of 3.5/fs [s] or
more are considered to be signals.
Pulses of less than 7/fc [s] are eliminated as
noise. Pulses of 25/fc [s] or more are considered
to be signals. In the SLOW or the SLEEP mode,
pulses of less than 1/fs [s] are eliminated as
noise. Pulses of 3.5/fs [s] or more are consid-
ered to be signals.
Pulses of less than 7/fc [s] are eliminated as
noise. Pulses of 25/fc [s] or more are considered
to be signals. In the SLOW or the SLEEP mode,
pulses of less than 1/fs [s] are eliminated as
noise. Pulses of 3.5/fs [s] or more are consid-
ered to be signals.
Pulses of less than 2/fc [s] are eliminated as
noise. Pulses of 7/fc [s] or more are considered
to be signals. In the SLOW or the SLEEP mode,
pulses of less than 1/fs [s] are eliminated as
noise. Pulses of 3.5/fs [s] or more are consid-
ered to be signals.
pin input.
INT0
T5CL8