PIC18F45K20-E/P Microchip Technology, PIC18F45K20-E/P Datasheet - Page 57

• Manufacturer Part Number: PIC18F45K20-E/P
• Description: 32KB, Flash, 1536bytes-RAM, 36I/O, 8-bit Family,nanowatt XLP 40 PDIP .600in TUBE
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F45K20-E/P

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM240313 - BOARD DEMO 8BIT XLPAC164112 - VOLTAGE LIMITER MPLAB ICD2 VPPDM164124 - KIT STARTER FOR PIC18F4XK20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FIGURE 3-44:
© 2009 Microchip Technology Inc.
LESSON 8 INTERRUPT SFRS
In the Lesson 8 source code, all the statements to change the rotation direction are in
the INT0 switch interrupt function, and the statements to rotate the LED display are in
the TMR0 interrupt function. All that remains in the main program is a while() loop
that updates the PORTD register with LED_Display. This statement could have also
been placed in the TMR0 interrupt function, but is left in the main program to illustrate
how the main program runs continuously and interacts with the interrupts.
Single Priority Interrupts
If only a single level of interrupts were used (RCON bit IPEN = 0), then it is only
necessary to define the interrupt vector at 0x0008, and a single Interrupt Service
Routine function with #pragma interrupt. All priority bit settings are ignored. The
function of the INTCON bits GIEH and GIEL become GIE and PEIE, respectively, with
the following functions:
3.8.3
Build and program the Lesson 8 project, then Run the application in the debugger.
Turning the demo board potentiometer will affect the rotation speed of the LEDs. The
switch may be pressed to reverse the rotation. Use breakpoints to explore the
interrupting functions.
INTCONbits.GIE
Build and Run the Lesson 8 Code with PICkit 3 Debug Express
PICkit™ 3 Debug Express Lessons
0
0
1
1
INTCONbits.PEIE Interrupt Functions
0
1
0
1
No Interrupts; all interrupts disabled.
No Interrupts; all interrupts disabled.
Only interrupts enabled in INTCONx
enabled.
All PIEx interrupts remain disabled.
All interrupts, including those enabled in
PIEx registers, are enabled.
DS41370C-page 53