DSPIC30F4013 Microchip Technology Inc., DSPIC30F4013 Datasheet - Page 50

• Manufacturer Part Number: DSPIC30F4013
• Description: Dspic30f3014/4013 High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

dsPIC30F3014/4013
6.2
6.2.1
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 WR and WREN bits in the NVMCON register.
Setting the WR bit initiates the erase, as shown in
Example 6-2.
EXAMPLE 6-2:
EXAMPLE 6-3:
DS70138E-page 48
; Select data EEPROM word, WR, WREN bits
; Start erase cycle by setting WR after writing key sequence
; 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 block, WR, WREN bits
; Start erase cycle by setting WR after writing key sequence
; 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
MOV
MOV
DISI
MOV
MOV
MOV
MOV
BSET
MOV
MOV
DISI
MOV
MOV
MOV
MOV
BSET
NOP
NOP
NOP
NOP
Erasing Data EEPROM
ERASING A BLOCK OF DATA
EEPROM
#4044,W0
W0
#5
#0x55,W0
W0
#0xAA,W1
W1
NVMCON,#WR
#4045,W0
W0
#5
#0x55,W0
W0
#0xAA,W1
W1
NVMCON,#WR
,
,
,
,
,
,
NVMCON
NVMKEY
NVMKEY
NVMCON
NVMKEY
NVMKEY
DATA EEPROM BLOCK ERASE
DATA EEPROM WORD ERASE
; Initialize NVMCON SFR
; Block all interrupts with priority <7 for
; next 5 instructions
;
; Write the 0x55 key
;
; Write the 0xAA key
; Initiate erase sequence
; Block all interrupts with priority <7 for
; next 5 instructions
;
; Write the 0x55 key
;
; Write the 0xAA key
; Initiate erase sequence
6.2.2
The NVMADRU and NVMADR registers must point to
the block. Select a block of data Flash and set the WR
and WREN bits in the NVMCON register. Setting the
WR bit initiates the erase, as shown in Example 6-3.
ERASING A WORD OF DATA
EEPROM
© 2007 Microchip Technology Inc.