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DSPIC30F0010AT-20E/PF 数据表(PDF) 56 Page - Microchip Technology

部件名 DSPIC30F0010AT-20E/PF
功能描述  High-Performance, 16-Bit Digital Signal Controllers
PDF  236 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

DSPIC30F0010AT-20E/PF 数据表(HTML) 56 Page - Microchip Technology

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dsPIC30F6010A/6015
DS70150C-page 54
© 2007 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 WR 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 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 7-3.
EXAMPLE 7-3:
DATA EEPROM WORD ERASE
; Select data EEPROM block, WR, WREN bits
MOV
#4045,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, WR, WREN bits
MOV
#4044,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



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