DSPIC33FJ64GP306 Microchip Technology Inc., DSPIC33FJ64GP306 Datasheet - Page 147
DSPIC33FJ64GP306
Manufacturer Part Number
DSPIC33FJ64GP306
Description
High-performance, 16-bit Digital Signal Controllers
Manufacturer
Microchip Technology Inc.
Datasheet
1.DSPIC33FJ64GP306.pdf
(324 pages)
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10.0
All of the device pins (except V
OSC1/CLKIN) are shared between the peripherals and
the parallel I/O ports. All I/O input ports feature Schmitt
Trigger inputs for improved noise immunity.
10.1
A parallel I/O port that shares a pin with a peripheral is,
in general, subservient to the peripheral. The periph-
eral’s output buffer data and control signals are
provided to a pair of multiplexers. The multiplexers
select whether the peripheral or the associated port
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 10-1 shows
how ports are shared with other peripherals and the
associated I/O pin to which they are connected.
FIGURE 10-1:
© 2007 Microchip Technology Inc.
Note:
I/O PORTS
Parallel I/O (PIO) Ports
This data sheet summarizes the features
of
of dsPIC33FJXXXGPX06/X08/X10
devices. It is not intended to be a compre-
hensive reference source. To complement
the information in this data sheet, refer to
the “dsPIC33F Family Reference Manual”.
Please refer to the Microchip web site
(www.microchip.com)
dsPIC33F
sections.
Read TRIS
Data Bus
WR TRIS
WR LAT +
WR PORT
Read LAT
Read Port
BLOCK DIAGRAM OF A TYPICAL SHARED PORT STRUCTURE
Family
Peripheral Module
Peripheral Input Data
Peripheral Module Enable
Peripheral Output Enable
Peripheral Output Data
this
PIO Module
Reference
DD
TRIS Latch
Data Latch
D
D
CK
CK
, V
for
dsPIC33FJXXXGPX06/X08/X10
SS
Q
Q
, MCLR and
the
Manual
group
latest
Output Multiplexers
When a peripheral is enabled and actively driving an
associated pin, the use of the pin as a general purpose
output pin is disabled. The I/O pin may be read, but the
output driver for the parallel port bit will be disabled. If
a peripheral is enabled, but the peripheral is not
actively driving a pin, that pin may 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 a ‘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 pins will read as zeros.
When a pin is shared with another peripheral or func-
tion that is defined as an input only, it is nevertheless
regarded as a dedicated port because there is no
other competing source of outputs. An example is the
INT4 pin.
1
1
0
0
Note:
Output Enable
Output Data
The voltage on a digital input pin can be
between -0.3V to 5.6V.
Input Data
I/O
I/O Pin
DS70286A-page 145
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