
2011-2012 Microchip Technology Inc.
Preliminary
DS61168D-page 143
PIC32MX1XX/2XX
11.0 I/O PORTS
General purpose I/O pins are the simplest of peripher-
als. They allow the PIC MCU to monitor and control
other devices. To add flexibility and functionality, some
pins are multiplexed with alternate function(s). These
functions depend on which peripheral features are on
the device. In general, when a peripheral is functioning,
that pin may not be used as a general purpose I/O pin.
Following are some of the key features of this module:
Individual output pin open-drain enable/disable
Individual input pin weak pull-up and pull-down
Monitor selective inputs and generate interrupt
when change in pin state is detected
Operation during CPU Sleep and Idle modes
Fast bit manipulation using CLR, SET and INV
registers
multiplexed I/O port.
FIGURE 11-1:
BLOCK DIAGRAM OF A TYPICAL MULTIPLEXED PORT STRUCTURE
Note 1: This data sheet summarizes the features
of the PIC32MX1XX/2XX family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 12. “I/O Ports”
(DS61120)
in
the
“PIC32
Family
(www.microchip.com/PIC32). 2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
this data sheet for device-specific register
and bit information.
Peripheral Output Data
Peripheral Module
Peripheral Output Enable
PIO Module
Peripheral Module Enable
WR LAT
I/O Pin
WR PORT
Data Bus
RD LAT
RD PORT
RD TRIS
WR TRIS
0
1
RD ODC
SYSCLK
Q
D
CK
EN Q
Q
D
CK
EN Q
Q
D
CK
EN Q
Q
D
CK
Q
D
CK
Q
0
1
SYSCLK
WR ODC
ODC
TRIS
LAT
Sleep
1
0
1
0
Output Multiplexers
I/O Cell
Synchronization
R
Peripheral Input
Legend:
R = Peripheral input buffer types may vary. Refer to
Table 1-1 for peripheral details.
Note:
This block diagram is a general representation of a shared port/peripheral structure for illustration purposes only. The actual structure
for any specific port/peripheral combination may be different than it is shown here.
Peripheral Input Buffer