PIC24F08KA102-I Datasheet, PDF (56/278 Pages) Microchip Technology – 20/28-Pin General Purpose, 16-Bit Flash Microcontrollers with nanoWatt XLP Technology

PIC24F16KA102 FAMILY
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;
int data;
unsigned int offset;
// Data read from EEPROM
// Variable located in EEPROM,declared
// as a global variable
// 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
DS39927C-page 56
 2008-2011 Microchip Technology Inc.