PIC24FV32KA304-I/PT Microchip Technology, PIC24FV32KA304-I/PT Datasheet - Page 71

• Manufacturer Part Number: PIC24FV32KA304-I/PT
• Description: MCU 32KB FLASH 2KB RAM 44-TQFP
• Manufacturer: Microchip Technology

Specifications of PIC24FV32KA304-I/PT

• Processor Series: PIC24FV
• Core: PIC
• Data Bus Width: 16 bit
• Program Memory Type: Flash
• Program Memory Size: 32 KB
• Data Ram Size: 2 KB
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-44
• Development Tools By Supplier: MPLAB IDE Software
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

6.4.1.1
To erase the entire data EEPROM (bulk erase), the
address registers do not need to be configured
because this operation affects the entire data
EEPROM. The following sequence helps in performing
a bulk erase:
1.
2.
3.
4.
5.
A typical bulk erase sequence is provided in
Example
EXAMPLE 6-3:
EXAMPLE 6-4:
 2011 Microchip Technology Inc.
int __attribute__ ((space(eedata))) eeData = 0x1234;
Configure NVMCON to Bulk Erase mode.
Clear NVMIF status bit and enable NVM
interrupt (optional).
Write the key sequence to NVMKEY.
Set the WR bit to begin erase cycle.
Either poll the WR bit or wait for the NVM
interrupt (NVMIF set).
int newData;
unsigned int offset;
// Set up NVMCON to erase one word of data EEPROM
NVMCON = 0x4004;
// Set up a pointer to the EEPROM location to be erased
TBLPAG = __builtin_tblpage(&eeData);
offset = __builtin_tbloffset(&eeData);
__builtin_tblwtl(offset, newData);
asm volatile ("disi #5");
__builtin_write_NVM();
while(NVMCONbits.WR=1);
// Set up NVMCON to bulk erase the data EEPROM
NVMCON = 0x4050;
// Disable Interrupts For 5 Instructions
asm volatile ("disi #5");
// Issue Unlock Sequence and Start Erase Cycle
__builtin_write_NVM();
6-3.
Data EEPROM Bulk Erase
DATA EEPROM BULK ERASE
SINGLE-WORD WRITE TO DATA EEPROM
PIC24FV32KA304 FAMILY
6.4.2
To write a single word in the data EEPROM, the
following sequence must be followed:
1.
2.
3.
A typical single-word write sequence is provided in
Example
// Global variable located in EEPROM
// Initialize EE Data page pointer
// Initizlize lower word of address
// Write EEPROM data to write latch
// Disable Interrupts For 5 Instructions
// Issue Unlock Sequence & Start Write Cycle
// Optional: Poll WR bit to wait for
// New data to write to EEPROM
// write sequence to complete
Erase one data EEPROM word (as mentioned in
the
(NVMCON<12>) is set to ‘1’.
Write the data word into the data EEPROM
latch.
Program the data word into the EEPROM:
- Configure the NVMCON register to program one
- Clear NVMIF status bit and enable NVM
- Write the key sequence to NVMKEY.
- Set the WR bit to begin erase cycle.
- Either poll the WR bit or wait for the NVM
- To get cleared, wait until NVMIF is set.
EEPROM word (NVMCON<5:0> = 0001xx).
interrupt (optional).
interrupt (NVMIF set).
6-4.
previous
SINGLE-WORD WRITE
section)
if
PGMONLY
DS39995B-page 71
bit