PIC24HJ32GP202-I/SO Microchip Technology Inc., PIC24HJ32GP202-I/SO Datasheet - Page 95

• Manufacturer Part Number: PIC24HJ32GP202-I/SO
• Description: 16-BIT MCU, 28LD, 32KB FLASH, 40 MIPS, NANOWATT
• Manufacturer: Microchip Technology Inc.

Specifications of PIC24HJ32GP202-I/SO

• A/d Inputs: 10 Channel, 12-Bit
• Cpu Speed: 40 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 21
• Interface: I2C/SPI/UART
• Memory Type: Flash
• Number Of Bits: 16
• Package Type: 28-pin SOIC
• Programmable Memory: 32K Bytes
• Ram Size: 2K Bytes
• Timers: 3-16-bit, 1-32-bit
• Voltage, Range: 3-3.6 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

9.0
All of the device pins (except V
OSC1/CLKI) are shared among 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
generally
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
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:
© 2007 Microchip Technology Inc.
Note:
I/O PORTS
Parallel I/O (PIO) Ports
This data sheet summarizes the features
of
PIC24HJ16GP304 devices. It is not
intended to be a comprehensive reference
source. To complement the information in
this data sheet, refer to the “PIC24H
Family Reference Manual”.
subservient
PIC24HJ32GP202/204 and PIC24HJ16GP304
Read Port
Data Bus
WR TRIS
WR LAT +
WR Port
Read LAT
Read TRIS
the
BLOCK DIAGRAM OF A TYPICAL SHARED PORT STRUCTURE
PIC24HJ32GP202/204
Peripheral Output Enable
Peripheral Module Enable
Peripheral Output Data
Peripheral Input Data
Peripheral Module
to
PIO Module
the
DD
TRIS Latch
Data Latch
D
D
CK
CK
, V
peripheral.
SS
Q
Q
, MCLR and
and
The
Preliminary
Output Multiplexers
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. This means that 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.
1
0
1
0
Output Enable
Output Data
Input Data
I/O
I/O Pin
DS70289A-page 93