PIC24FV32KA304 datasheet(72/320 Pages) MICROCHIP

Teilenummer	PIC24FV32KA304

Bauteilbeschribung	20/28/44/48-Pin, General Purpose, 16-Bit Flash Microcontrollers with XLP Technology

PDF	320 Pages

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Hersteller	MICROCHIP [Microchip Technology]

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PIC24FV32KA304 FAMILY

DS39995B-page 72

 2011 Microchip Technology Inc.

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

management

(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;

// Global 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

PIC24FV32KA304 Datenblatt(PDF) 72 Page - Microchip Technology