FDC37C935-QS Standard Microsystems (SMSC), FDC37C935-QS Datasheet - Page 115

• Manufacturer Part Number: FDC37C935-QS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C935-QS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

General Purpose I/O Configuration Registers
Assigned to each GPI/O port is an 8-bit GPI/O
Configuration
independently program each I/O port.
GPI/O
accessible when the FDC37C93x is in the
Configuration Mode; more information can be
found in the Configuration section of this
specification.
Each GPI/O port may be programmed as either
a simple inverting or non-inverting input or
output port, or as an alternate function port. The
least-significant
Configuration Register define the operation of
the respective GPI/O port.
operations are outlined in Table 48.
In addition, the GPI/O port may be optionally
programmed
0=DISABLE
1=SELECT
ALT FUNC
BIT 3
0
0
0
0
0
0
0
0
1
1
1
Configuration
0=DISABLE
1=ENABLE
INT EN
Register
to
BIT 2
four
0
0
0
0
1
1
1
1
0
0
0
steer
bits
Table 48 - GPI/O Configuration Register Bits [3:0]
Registers
which
0=NO INVERT
POLARITY
1=INVERT
of
The basic GPI/O
BIT 1
its signal to a
0
0
1
1
0
0
1
1
0
0
1
each
is
are
used
GPI/O
0=OUTPUT
1=INPUT
only
The
BIT 0
I/O
to
0
1
0
1
0
1
0
1
0
1
0
115
output pin on the FDC37C93x.
channel for the Combined Interrupt is selected
by the GP_INT Configuration Register defined in
the FDC37C93x System Configuration Section.
The Combined Interrupt is the "ORed" function
of the interrupt enabled GPI/O ports and will
represent a standard ISA interrupt (edge high).
When programmed as an input steered onto
the General Purpose Combined Interrupt (GP
IRQ), the Interrupt Circuitry contains a
selectable debounce/digital filter circuit in
order that switches or push-buttons may be
directly connected to the chip. This filter shall
reject signals with pulse widths of 1ms or less.
Note: there are three sets of Interrupt circuits
(two dedicated and one general purpose) each
of which contains an individually selectable
debounce filter.
simple non-inverting output
simple non-inverting input
simple inverting output
simple inverting input
non-inverting output steered back to GP IRQ
non-inverting input steered to GP IRQ
inverting output steered back to GP IRQ
inverting input steered to GP IRQ
Alternate Function Output-type : Alternate non-inverted
output.
Alternate Function Input-type :Alternate function not valid,
GPI/O pin acts as a simple non-inverting output.
Alternate Function Output-type : Alternate function not
valid, GPI/O pin acts as a simple non-inverting input.
Alternate Function Input-type : Alternate non-inverting
input.
Alternate Function Output-type : Alternate output function
with inverted sense
Alternate Function Input-type : Alternate function not valid,
GPI/O pin acts as a simple inverting output.
GPI/O PORT
OPERATION
The interrupt