PIC24FJ16GA002-E/ML Microchip Technology, PIC24FJ16GA002-E/ML Datasheet - Page 110

• Manufacturer Part Number: PIC24FJ16GA002-E/ML
• Description: IC PIC MCU FLASH 16K 28-QFN
• Manufacturer: Microchip Technology
• Series: PIC® 24Fr

Specifications of PIC24FJ16GA002-E/ML

• Program Memory Type: FLASH
• Program Memory Size: 16KB (5.5K x 24)
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Core Processor: PIC
• Core Size: 16-Bit
• Speed: 32MHz
• Connectivity: I²C, PMP, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 21
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Processor Series: PIC24FJ
• Core: PIC
• Data Bus Width: 16 bit
• Data Ram Size: 4 KB
• Interface Type: I2C, IrDA, SPI, UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 21
• Number Of Timers: 5
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DM240011, MA240013, AC164127, DM300027, DV164033, DM240002
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 10 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM240011 - KIT STARTER MPLAB FOR PIC24F MCUAC162088 - HEADER MPLAB ICD2 24FJ64GA004 28AC164336 - MODULE SOCKET FOR PM3 28/44QFNDV164033 - KIT START EXPLORER 16 MPLAB ICD2
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC24FJ64GA004 FAMILY
10.4.5
The ability to control peripheral pin selection introduces
several considerations into application design that
could be overlooked. This is particularly true for several
common peripherals that are available only as
remappable peripherals.
The main consideration is that the peripheral pin
selects are not available on default pins in the device’s
default (Reset) state. Since all RPINRx registers reset
to ‘11111’ and all RPORx registers reset to ‘00000’, all
peripheral pin select inputs are tied to RP31 and all
peripheral pin select outputs are disconnected.
This situation requires the user to initialize the device
with the proper peripheral configuration before any
other application code is executed. Since the IOLOCK
bit resets in the unlocked state, it is not necessary to
execute the unlock sequence after the device has
come out of Reset. For application safety, however, it is
best to set IOLOCK and lock the configuration after
writing to the control registers.
Because the unlock sequence is timing critical, it must
be executed as an assembly language routine in the
same manner as changes to the oscillator configura-
tion. If the bulk of the application is written in C or
another high-level language, the unlock sequence
should be performed by writing inline assembly.
Choosing the configuration requires the review of all
peripheral pin selects and their pin assignments,
especially those that will not be used in the application.
In all cases, unused pin-selectable peripherals should
be disabled completely. Unused peripherals should
have their inputs assigned to an unused RPn pin
function. I/O pins with unused RPn functions should be
configured with the null peripheral output.
The assignment of a peripheral to a particular pin does
not automatically perform any other configuration of the
pin’s I/O circuitry. In theory, this means adding a
pin-selectable output to a pin may mean inadvertently
driving an existing peripheral input when the output is
driven. Users must be familiar with the behavior of
other fixed peripherals that share a remappable pin and
know when to enable or disable them. To be safe, fixed
digital peripherals that share the same pin should be
disabled when not in use.
Along these lines, configuring a remappable pin for a
specific peripheral does not automatically turn that fea-
ture on. The peripheral must be specifically configured
for operation and enabled, as if it were tied to a fixed pin.
Where this happens in the application code (immediately
following device Reset and peripheral configuration or
inside the main application routine) depends on the
peripheral and its use in the application.
DS39881D-page 110
Note:
CONSIDERATIONS FOR
PERIPHERAL PIN SELECTION
In tying peripheral pin select inputs to
RP31, RP31 does not have to exist on a
device for the registers to be reset to it.
A final consideration is that peripheral pin select func-
tions neither override analog inputs, nor reconfigure
pins with analog functions for digital I/O. If a pin is
configured as an analog input on device Reset, it must
be explicitly reconfigured as digital I/O when used with
a peripheral pin select.
Example 10-2 shows a configuration for bidirectional
communication with flow control using UART1. The
following input and output functions are used:
• Input Functions: U1RX, U1CTS
• Output Functions: U1TX, U1RTS
EXAMPLE 10-2:
//*************************************
// Unlock Registers
//*************************************
asm volatile (
//***************************
// Configure Input Functions
// (See Table 10-2)
//***************************
//***************************
// Configure Output Functions
// (See Table 10-3)
//***************************
//*************************************
// Lock Registers
//*************************************
asm volatile ( "MOV
//***************************
// Assign U1RX To Pin RP0
//***************************
RPINR18bits.U1RXR = 0;
//***************************
// Assign U1CTS To Pin RP1
//***************************
RPINR18bits.U1CTSR = 1;
//***************************
// Assign U1TX To Pin RP2
//***************************
RPOR1bits.RP2R = 3;
//***************************
// Assign U1RTS To Pin RP3
//***************************
RPOR1bits.RP3R = 4;
"MOV
"MOV
"MOV
"MOV.b
"MOV.b
"BCLR OSCCON,#6");
"MOV
"MOV
"MOV.b
"MOV.b
"BSET
CONFIGURING UART1
INPUT AND OUTPUT
FUNCTIONS
 2010 Microchip Technology Inc.
#OSCCON, w1
#0x46, w2
#0x57, w3
w2, [w1]
w3, [w1]
#OSCCON, w1
#0x46, w2
#0x57, w3
w2, [w1]
w3, [w1]
OSCCON, #6"
\n"
\n"
\n"
\n"
\n"
\n"
\n"
\n"
\n"
\n"
);