Microstick for the PIC24
Microchip Microstick
• Easy to use, economical development
environment for 16-bit PIC Microcontrollers.
– Socketed connection for PIC24 family microcontrollers
– USB Powered; no external power required
– Built-in integrated programmer/debugger
• No bootloader needed
• We’ll use the PIC24HJ64GP502 microcontroller with the
Microstick
• Same family as PIC24HJ32GP202 but more program memory
– Same ISA and pinout
Board Configuration
Power supplied
through USB
cable
Programming using MPLAB
1.
2.
3.
4.
5.
6.
7.
Load the code into MPLAB IDE.
Inform MPLAB IDE what device is plugged in to the Microstick
Board by selecting the appropriate device from the
Configure>Select Device>Device menu. Choose PIC24HJ64GP502.
Build the project by selecting Project>Build All.
Connect the Microstick Board to the development computer via a
USB cable.
Enable the MPLAB IDE debugger by selecting Debugger>Select
Tool>Starter Kits.
Download your code into a device on the Microstick Board by
selecting Debugger>Program.
Run the application previously downloaded by selecting
Debugger>Run.
Configuration Bits
•Optionally, you can modify the configuration bits to
disable the Watchdog Timer
•Select Configure>Configuration Bits to change the timer
Writing LATx is the same as writing PORTx
A Demo
Program
RB15
.include "p24Hxxxx.inc"
.global __reset
.text
;Start of Code section
__reset:
mov #__SP_init, W15
mov #__SPLIM_init,W0
mov W0, SPLIM
; set bit 15 to 0 so RB15 is set to output
mov #0x7FFF,W4
mov W4,TRISB
mloop:
mov #0x8000,W5
mov W5,PORTB ; set bit 15 to 1
call delay
mov #0x0000,W5
mov W5,PORTB ; set bit 15 to 0
call delay
bra mloop
delay:
mov #0xFFFF,W6
dloop:
dec W6,W6
cp0 W6
bra NZ, dloop
return
.end