Philips CEM2100/00, Service Manual

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Page 43
T
5CL8
3.7 External Interrupts
The T
5CL8
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
INT0
/P00 pin can be configured as either an external inter-
rupt input pin or an input/output port, and is configured as an input port during reset.
Edge selection, noise reject control and
INT0
/P00 pin function selection are performed by the external interrupt
control register (EINTCR).
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
INT0
pin input.
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.
Source Pin Enable Conditions Release Edge Digital Noise Reject
INT0
INT0
IMF ΠEF4 ΠINT0EN=1 Falling edge
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.
INT1 INT1 IMF ΠEF6 = 1
Falling edge
or
Rising edge
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.
INT2 INT2 IMF ΠEF8 = 1
Falling edge
or
Rising edge
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.
INT3 INT3 IMF ΠEF12 = 1
Falling edge
or
Rising edge
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.
INT5
INT5
IMF ΠEF23 = 1 Falling edge
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.