PIC18F25J50-I/SS Microchip Technology, PIC18F25J50-I/SS Datasheet - Page 10

• Manufacturer Part Number: PIC18F25J50-I/SS
• Description: IC PIC MCU FLASH 32K 2V 28-SSOP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F25J50-I/SS

• Program Memory Type: FLASH
• Program Memory Size: 32KB (16K x 16)
• Package / Case: 28-SSOP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 16
• Ram Size: 3.8K x 8
• Voltage - Supply (vcc/vdd): 2.15 V ~ 3.6 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 3776 B
• Interface Type: EUSART, I2C, SPI
• Maximum Clock Frequency: 48 MHz
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, DM183022, DM183032, DV164136, MA180024
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 10 Channel
• Package: 28SSOP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 48 MHz
• Operating Supply Voltage: 2.5|3.3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164322 - MODULE SOCKET MPLAB PM3 28/44QFN
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2008 Microchip Technology Inc.
1.2.2
The USB Firmware Framework provides a set of modular firmware interfaces that
handle most of the work for implementing USB communications. Figure 1-2 shows a
typical USB program flow. Each firmware reference project is written to have a
cooperative multitasking environment; thus, no blocking functions should be
implemented.
The main() function is an infinite loop that services different tasks. These can be
logically thought of as either a USB task or a user task. USB tasks are handled by
USBTasks(), which polls and services all USB hardware interrupts.
FIGURE 1-2:
1.2.3
1. Launch MPLAB IDE.
2. From the MPLAB IDE menu bar, select File > Open Workspace...
3. Navigate and select the workspace file. Please see the release notes associated
4. Return to the menu bar and select Project > Build Options... > Project. The Build
5. Click on the Directories tab and verify the following:
Main
{
}
//Stack Callbacks
USBCBSuspend()
USBCBWakeFromSuspend
USBCB_SOF_Handler()
USBCBErrorHandler()
USBCBCheckOtherReq()
USBCBStdSetDscHandler()
USBCBInitEP()
USBCBSendResume()
with the stack for more information about the reference designs available.
Options dialog appears (Figure 1-3).
• The Output Directory and Intermediary Directory paths point to the
• The Include Search Path directory includes the following entries: “.”,
• The Library Search Path points to the “lib” directory under the appropriate
• The Linker-Script Path points to the directory of the project’s linker script file.
USBDeviceInit();
while(1)
{
}
directory where the output files should be placed.
..\Include, ..\Microchip\Include, and ..\..<Application> (see
Figure 1-3 for an example). This allows the files within the Framework to locate
the application-specific configuration files as well as the application-specific
code to reach the Framework functions.
compilers installation directory.
USBTasks();
The Logical Structure
Configuring MPLAB IDE for the Framework
main.c
LOGICAL STRUCTURE OF THE FIRMWARE FRAMEWORK
USBCheckHIDRequest()
HIDTxHandleBusy()
HIDTxPacket()
Device Descriptor
Configuration Descriptor(s)
String Descriptor(s)
USBDescriptors.c
hid.c
USBEnableEndpoint()
USBStallEndpoint()
USBTransferOnePacket()
USBHandleBusy()
USBHandleGetLength()
USBHandleGetAddr()
...
USBDeviceInit(void)
{
}
USBTasks(void)
{
}
...
...
USBDevice.c
DS51679B-page 6