PIC24F16KA102 datasheet(58/254 Pages) MICROCHIP

Part #	PIC24F16KA102

Description	20/28-Pin General Purpose, 16-Bit Flash Microcontrollers with nanoWatt XLP??Technology

PDF	254 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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PIC24F16KA102 FAMILY

DS39927B-page 56

Preliminary

6.4.3

READING THE DATA EEPROM

To read a word from data EEPROM, the table read

instruction is used. Since the EEPROM array is only

16 bits wide, only the TBLRDL instruction is needed.

The read operation is performed by loading TBLPAG

and WREG with the address of the EEPROM location

followed by a TBLRDL instruction.

A typical read sequence, using the Table Pointer manage-

ment (builtin_tblpage and builtin_tbloffset)

and table read (builtin_tblrdl) procedures from the

C30 compiler library, is provided in Example 6-5.

Program Space Visibility (PSV) can also be used to

read locations in the data EEPROM.

EXAMPLE 6-5:

READING THE DATA EEPROM USING THE TBLRD COMMAND

int __attribute__ ((space(eedata))) eeData = 0x1234;

// Variable located in EEPROM

int data;

// Data read from EEPROM

unsigned int offset;

// Set up a pointer to the EEPROM location to be erased

TBLPAG = __builtin_tblpage(&eeData);

// Initialize EE Data page pointer

offset = __builtin_tbloffset(&eeData);

// Initizlize lower word of address

data = __builtin_tblrdl(offset);

// Write EEPROM data to write latch

PIC24F16KA102 Datasheet(PDF) 58 Page - Microchip Technology