PIC18F45K20-E/P Microchip Technology, PIC18F45K20-E/P Datasheet - Page 66

• 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

PICkit™ 3 Debug Express
DS41370C-page 62
FIGURE 3-52:
Once a pointer to program memory has been declared, it can be pointed to a declared
location in program memory, for example a #pragma romdata array, or an explicit
address.
The first letter ‘H’ of the hello_str[] array in program memory is now pointed to by
rom_pointer. The value of the variable letter is now ‘H’
Now, rom_pointer points to the program memory byte at address 0x320.
Reading Flash program memory then simply requires declaring a ROM pointer and
using an assignment statement to read the pointer value.
#pragma romdata mystrings = 0x100
rom char hello_str[] = "Hello!";
rom_pointer
char
rom_pointer
letter
=
=
=
PROJECT CODE MODEL SETTINGS
(near rom char *)0x320;
hello_str;
*rom_pointer
//
=
&hello_str[0]
© 2009 Microchip Technology Inc.