Datasheet

dsPIC30F3010/3011
DS70141F-page 58 © 2010 Microchip Technology Inc.
7.2 Erasing Data EEPROM
7.2.1 ERASING A BLOCK OF DATA
EEPROM
In order to erase a block of data EEPROM, the
NVMADRU and NVMADR registers must initially
point to the block of memory to be erased. Configure
NVMCON for erasing a block of data EEPROM, and
set the ERASE and WREN bits in the NVMCON
register. Setting the WR bit initiates the erase, as
shown in Example 7-2.
EXAMPLE 7-2: DATA EEPROM BLOCK ERASE
7.2.2 ERASING A WORD OF DATA
EEPROM
The TBLPAG and NVMADR registers must point to
the block. Select erase a block of data Flash, and set
the ERASE and WREN bits in the NVMCON register.
Setting the WR bit initiates the erase, as shown in
Example 7-3.
EXAMPLE 7-3: DATA EEPROM WORD ERASE
; Select data EEPROM block, ERASE, WREN bits
MOV #0x4045,W0
MOV W0
,
NVMCON ; Initialize NVMCON SFR
; Start erase cycle by setting WR after writing key sequence
DISI #5 ; Block all interrupts with priority <7
; for next 5 instructions
MOV #0x55,W0 ;
MOV W0
,
NVMKEY ; Write the 0x55 key
MOV #0xAA,W1 ;
MOV W1
,
NVMKEY ; Write the 0xAA key
BSET NVMCON,#WR ; Initiate erase sequence
NOP
NOP
; Erase cycle will complete in 2mS. CPU is not stalled for the Data Erase Cycle
; User can poll WR bit, use NVMIF or Timer IRQ to determine erasure complete
; Select data EEPROM word, ERASE, WREN bits
MOV #0x4044,W0
MOV W0
,
NVMCON
; Start erase cycle by setting WR after writing key sequence
DISI #5 ; Block all interrupts with priority <7
; for next 5 instructions
MOV #0x55,W0 ;
MOV W0
,
NVMKEY ; Write the 0x55 key
MOV #0xAA,W1 ;
MOV W1
,
NVMKEY ; Write the 0xAA key
BSET NVMCON,#WR ; Initiate erase sequence
NOP
NOP
; Erase cycle will complete in 2mS. CPU is not stalled for the Data Erase Cycle
; User can poll WR bit, use NVMIF or Timer IRQ to determine erasure complete