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dsPIC30F3012 Datasheet

  • dsPIC30F3012

  • High-Performance,16-bit Digital Signal Controllers

  • 1759.49KB

  • 210页

  • Microchip   Microchip

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dsPIC30F2011/2012/3012/3013
6.2
6.2.1
Erasing Data EEPROM
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 6-2.
EXAMPLE 6-2:
DATA EEPROM BLOCK 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
;
; Write the 0x55 key
MOV
W0
,
NVMKEY
MOV
#0xAA,W1
;
; Write the 0xAA key
MOV
W1
,
NVMKEY
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
6.2.2
ERASING A WORD OF DATA
EEPROM
The NVMADRU 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 6-3.
EXAMPLE 6-3:
DATA EEPROM WORD ERASE
; 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
;
; Write the 0x55 key
MOV
W0
,
NVMKEY
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
DS70139C-page 54
Preliminary
漏
2005 Microchip Technology Inc.

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