DSPIC33FJ64GS406 Microchip Technology Inc., DSPIC33FJ64GS406 Datasheet - Page 209
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DSPIC33FJ64GS406
Manufacturer Part Number
DSPIC33FJ64GS406
Description
High-performance, 16-bit Digital Signal Controllers
Manufacturer
Microchip Technology Inc.
Datasheet
1.DSPIC33FJ64GS406.pdf
(418 pages)
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11.0
All of the device pins (except V
OSC1/CLKI) are shared among the peripherals and the
parallel I/O ports. All I/O input ports feature Schmitt
Trigger inputs for improved noise immunity.
11.1
Generally a parallel I/O port that shares a pin with a
peripheral is subservient to the peripheral. The
peripheral’s output buffer data and control signals are
provided to a pair of multiplexers. The multiplexers
select whether the peripheral or the associated port
FIGURE 11-1:
2010 Microchip Technology Inc.
dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610
Note 1: This data sheet summarizes the features
2: Some registers and associated bits
Parallel I/O (PIO) Ports
I/O PORTS
of the dsPIC33FJ32GS406/606/608/610
and
families of devices. It is not intended to be
a comprehensive reference source. To
complement the information in this data
sheet, refer to Section 10. “I/O Ports”
(DS70193) in the “dsPIC33F/PIC24H
Family Reference Manual”, which is avail-
able from the Microchip web site
(www.microchip.com).
described in this section may not be avail-
able on all devices. Refer to Section 4.0
“Memory Organization” in this data
sheet for device-specific register and bit
information.
Read LAT
Read PORT
Read TRIS
Data Bus
WR TRIS
WR LAT +
WR PORT
dsPIC33FJ64GS406/606/608/610
BLOCK DIAGRAM OF A TYPICAL SHARED PORT STRUCTURE
Peripheral Output Enable
Peripheral Module Enable
Peripheral Output Data
Peripheral Input Data
Peripheral Module
PIO Module
DD
TRIS Latch
Data Latch
D
D
CK
CK
, V
SS
Q
Q
, MCLR and
Preliminary
Output Multiplexers
has ownership of the output data and control signals of
the I/O pin. The logic also prevents “loop through”, in
which a port’s digital output can drive the input of a
peripheral that shares the same pin. Figure 11-1 shows
how ports are shared with other peripherals and the
associated I/O pin to which they are connected.
When a peripheral is enabled and the peripheral is
actively driving an associated pin, the use of the pin as
a general purpose output pin is disabled. The I/O pin
can be read, but the output driver for the parallel port bit
is disabled. If a peripheral is enabled, but the peripheral
is not actively driving a pin, that pin can be driven by a
port.
All port pins have three registers directly associated
with their operation as digital I/O. The data direction
register (TRISx) determines whether the pin is an input
or an output. If the data direction bit is ‘1’, then the pin
is an input. All port pins are defined as inputs after a
Reset. Reads from the latch (LATx) read the latch.
Writes to the latch write the latch. Reads from the port
(PORTx) read the port pins, while writes to the port pins
write the latch.
Any bit and its associated data and control registers
that are not valid for a particular device will be
disabled. That means the corresponding LATx and
TRISx registers and the port pin will read as zeros.
When a pin is shared with another peripheral or
function that is defined as an input only, it is
nevertheless regarded as a dedicated port because
there is no other competing source of outputs.
1
0
1
0
Output Enable
Output Data
Input Data
I/O
I/O Pin
DS70591C-page 209
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