DM180021 Microchip Technology, DM180021 Datasheet - Page 13

• Manufacturer Part Number: DM180021
• Description: KIT STARTER MPLAB FOR PIC18F MCU
• Manufacturer: Microchip Technology
• Series: MPLAB®r
• Type: MCUr

Specifications of DM180021

• Contents: Board, Cable, CD
• Processor To Be Evaluated: PIC18F46J50
• Processor Series: PIC18F
• Interface Type: SPI
• Operating Supply Voltage: 3.3 V
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18F4xxx
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC18Fxxxx
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.1
© 2009 Microchip Technology Inc.
BOOTLOADER FROM THE MicroSD™ MEMORY CARD
Chapter 2. The Demonstration Application
This chapter describes the precompiled demonstration applications that are provided
with the MPLAB Starter Kit for PIC18F, and how various features highlight the device’s
processing power and hardware functionality. These include:
• Bootloader from the MicroSD Memory Card
• Interactive Display System (OLED)
• Touch Interface (CTMU)
• USB Device Capabilities
The Flash program memory of Microchip’s PIC18F46J50 device is readable, writable and
erasable during normal operation over the entire V
ability to perform bootloader operations. To demonstrate this feature, the MPLAB Starter
Kit for PIC18F is preprogrammed with a MicroSD bootloader that gives the ability to load,
program and run PIC18 applications from a MicroSD memory card. The bootloader appli-
cation extensively uses, and serves to demonstrate, the Microchip Memory Disk Drive
(MDD) file system.
The MicroSD bootloader accepts user inputs from the touch pads and scroll bar, uses the
OLED display for user outputs, and uses substantial parts of the Microchip Memory Disk
Drive file system to read files and folders from a MicroSD memory card.
Figure 2-1 summarizes the essential firmware design of the bootloader. At system Reset,
the MicroSD bootloader checks for a user request to run the bootloader (by pressing the
S1 switch within a 10-second window). If this is not the case, the bootloader returns
control to the application currently programmed in the microcontroller’s memory.
FIGURE 2-1:
Touch Pads and
Scroll Bar
FUNCTIONAL BLOCK DIAGRAM OF BOOTLOADER
MPLAB STARTER KIT FOR PIC18F
Program Memory
File System
Firmware
Interface
HEX File
Parser
Flash
User
MDD
DD
range. This feature gives users the
USER’S GUIDE
Flash Card
MicroSD™
Display
OLED
DS51852A-page 9