DSPIC30F datasheet(74/248 Pages) MICROCHIP

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dsPIC30F

DS70083G-page 72

Preliminary

 2004 Microchip Technology Inc.

7.3.2

WRITING A BLOCK OF DATA

EEPROM

To write a block of data EEPROM, write to all sixteen

latches first, then set the NVMCON register and

program the block.

EXAMPLE 7-5:

DATA EEPROM BLOCK WRITE

MOV

#LOW_ADDR_WORD,W0

; Init pointer

MOV

#HIGH_ADDR_WORD,W1

MOV

W1,TBLPAG

MOV

#data1,W2

; Get 1st data

TBLWTL

W2,[ W0]++

; write data

MOV

#data2,W2

; Get 2nd data

TBLWTL

W2,[ W0]++

; write data

MOV

#data3,W2

; Get 3rd data

TBLWTL

W2,[ W0]++

; write data

MOV

#data4,W2

; Get 4th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data5,W2

; Get 5th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data6,W2

; Get 6th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data7,W2

; Get 7th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data8,W2

; Get 8th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data9,W2

; Get 9th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data10,W2

; Get 10th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data11,W2

; Get 11th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data12,W2

; Get 12th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data13,W2

; Get 13th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data14,W2

; Get 14th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data15,W2

; Get 15th data

TBLWTL

W2,[ W0]++

; write data

MOV

#data16,W2

; Get 16th data

TBLWTL

W2,[ W0]++

; write data. The NVMADR captures last table access address.

MOV

#0x400A,W0

; Select data EEPROM for multi word op

MOV

W0,NVMCON

; Operate Key to allow program operation

DISI

; 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

; Start write cycle

NOP

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