PIC24FJ64GA006-I/PT Microchip Technology Inc., PIC24FJ64GA006-I/PT Datasheet - Page 101

• Manufacturer Part Number: PIC24FJ64GA006-I/PT
• Description: 64 PIN, 64KB FLASH, 8 KB RAM, 53 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC24FJ64GA006-I/PT

• A/d Inputs: 16 Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 16 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 53
• Interface: I2C/SPI/UART
• Memory Capacity: 64 Kbytes
• Memory Type: Flash
• Number Of Bits: 16
• Number Of Inputs: 53
• Number Of Pins: 64
• Package Type: 64-pin TQFP
• Programmable Memory: 64K Bytes
• Ram Size: 8K Bytes
• Speed: 16 MHz
• Timers: 5-16-bit
• Voltage, Range: 2-3.6 V
• Voltage, Rating: 2-3.6 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

9.0
All of the device pins (except V
OSC1/CLKI) are shared between the peripherals and
the parallel I/O ports. All I/O input ports feature Schmitt
Trigger inputs for improved noise immunity.
9.1
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 9-1 shows
how ports are shared with other peripherals and the
associated I/O pin to which they are connected.
FIGURE 9-1:
© 2006 Microchip Technology Inc.
Note:
I/O PORTS
Parallel I/O (PIO) Ports
This data sheet summarizes the features
of this group of PIC24FJ devices. It is not
intended to be a comprehensive reference
source.
Read Port
Read LAT
Read TRIS
Data Bus
WR TRIS
WR LAT +
WR Port
BLOCK DIAGRAM OF A TYPICAL SHARED PORT STRUCTURE
Peripheral Output Enable
Peripheral Output Data
Peripheral Input Data
Peripheral Module Enable
Peripheral Module
PIO Module
DD
TRIS Latch
Data Latch
D
D
CK
CK
, V
SS
Q
Q
, MCLR and
Preliminary
Output Multiplexers
PIC24FJ128GA FAMILY
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
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 pin 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
0
1
0
Output Enable
Output Data
Input Data
I/O
I/O Pin
DS39747C-page 99