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PIC24F16KA102 bảng dữ liệu(PDF) 58 Page - Microchip Technology

tên linh kiện PIC24F16KA102
Giải thích chi tiết về linh kiện  20/28-Pin General Purpose, 16-Bit Flash Microcontrollers with nanoWatt XLP??Technology
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nhà sản xuất  MICROCHIP [Microchip Technology]
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PIC24F16KA102 FAMILY
DS39927B-page 56
Preliminary
© 2009 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 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



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