Microchip Technology DV164039 Data Sheet
Development Board Hardware
2010 Microchip Technology Inc.
DS51911A-page 35
Due to pin constraints, some features of the development board overlap more than oth-
ers. In these cases, configuring the board for one major functionality means limiting or
disabling another. Table 4-2 shows the major areas of overlap. Additional details are
provided in the following sections.
ers. In these cases, configuring the board for one major functionality means limiting or
disabling another. Table 4-2 shows the major areas of overlap. Additional details are
provided in the following sections.
4.4.1
User-Defined Inputs and LEDs
The PIC24FJ256DA210 Development Board implements a variety of user-defined
inputs: push button switches, capacitance-sensing touch pads, a potentiometer, and
four LEDs. The development board multiplexes the switches, touch sensors, potenti-
ometer and three of the LEDs through three I/O pins (RB5, RE9 and RG8). For each of
these pins, only one input mode can be chosen at any given time. The fourth LED (D4)
shares a pin with an address line for the external memory devices.
inputs: push button switches, capacitance-sensing touch pads, a potentiometer, and
four LEDs. The development board multiplexes the switches, touch sensors, potenti-
ometer and three of the LEDs through three I/O pins (RB5, RE9 and RG8). For each of
these pins, only one input mode can be chosen at any given time. The fourth LED (D4)
shares a pin with an address line for the external memory devices.
Note that the implementation of shared inputs and outputs used in the development
board is not a recommended design practice. In this case, it is implemented in consid-
eration of I/O pin constraints. Using separate pins for different input and output features
is always recommended.
board is not a recommended design practice. In this case, it is implemented in consid-
eration of I/O pin constraints. Using separate pins for different input and output features
is always recommended.
If the CTMU touch sensors are enabled, the LEDs can be used simultaneously. How-
ever, care must be taken in the application to switch the I/O pins alternately as analog
input and digital output as required. Please refer to the “PIC24FJ256DA210 Family
Data Sheet” (DS39969) for details on configuring the I/O ports.
ever, care must be taken in the application to switch the I/O pins alternately as analog
input and digital output as required. Please refer to the “PIC24FJ256DA210 Family
Data Sheet” (DS39969) for details on configuring the I/O ports.
The user-defined features are configured using jumpers J13, J14 and J15. In some
cases, modifications to accompanying resistors are also required. The locations of the
components are shown in Figure 4-3. A summary of the jumper settings is provided in
Table 4-3.
cases, modifications to accompanying resistors are also required. The locations of the
components are shown in Figure 4-3. A summary of the jumper settings is provided in
Table 4-3.
TABLE 4-2:
SUMMARY OF BOARD CONFIGURATIONS VS. AVAILABILITY
OF SPECIFIC FEATURES
OF SPECIFIC FEATURES
Individual Feature
Board Configuration Options
No CTMU
CTMU
USB OTG
PICtail™ Plus Options
Flash and SRAM
access modes
access modes
Byte and
Word
Byte and
Word
Byte and
Word
Word only
(1)
Parallel Flash/
SPI Flash Memory
SPI Flash Memory
512 Kbytes/
2 Mbit
512 Kbytes/
2 Mbit
512 Kbytes/
2 Mbit
256 Kbytes/N.A.
SRAM
512 Kbytes
512 Kbytes
512 Kbytes
256 Kbytes
Resistive Touchscreen
OR Touch SPI channel
OR Touch SPI channel
Y
Y
Y
Y
Potentiometer
Y
N
N
Y
Touch pads (CTMU)
N
Y
(2)
N
N
User-defined Buttons
Y
N
N
Y
(2)
User-defined LEDs
N
Y
(3)
N
1
UART Channels
1
1
1
1
USB Modes
Host or
Device
Host or
Device
OTG only
Host or Device
PICtail Plus Expansion
N
Y
(3)
N
Y
Note 1:
The only display mode available in this configuration is 16 bpp.
2:
CTMU channels and push buttons are available with certain PICtail™ Daughter
Boards only. The number of inputs available depends on the daughter board and
the application. See Section 4.4.6 “PICtail™ Plus Card Modular Expansion
Connector” for additional information.
Boards only. The number of inputs available depends on the daughter board and
the application. See Section 4.4.6 “PICtail™ Plus Card Modular Expansion
Connector” for additional information.
3:
LED outputs are shared with CTMU input channels.