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PIC24FV32KA301 bảng dữ liệu(PDF) 72 Page - Microchip Technology

tên linh kiện PIC24FV32KA301
Giải thích chi tiết về linh kiện  20/28/44/48-Pin, General Purpose, 16-Bit Flash Microcontrollers with XLP Technology
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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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



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