Microchip Technology MA240017 Data Sheet

DS39927C-page 52

 2008-2011 Microchip Technology Inc.

 

R/S-0, HC

R/W-0

R/W-0

R/W-0

U-0

U-0

U-0

U-0

WR

WREN

WRERR

PGMONLY

—

—

—

—

bit 15

bit 8

U-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

—

ERASE

NVMOP5

NVMOP4

NVMOP3

NVMOP2

NVMOP1

NVMOP0

bit 7

bit 0

U = Unimplemented bit, read as ‘0’

R = Readable bit

W = Writable bit

S = Settable bit

HC = Hardware Clearable bit

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15

 Write Control bit (program or erase)

1

 = Initiates a data EEPROM erase or write cycle (can be set but not cleared in software)

0

 = Write cycle is complete (cleared automatically by hardware)

bit 14

 Write Enable bit (erase or program)

1

 = Enable an erase or program operation

0

 = No operation allowed (device clears this bit on completion of the write/erase operation)

bit 13

 Flash Error Flag bit

1

 = A write operation is prematurely terminated (any MCLR or WDT Reset during programming

operation)

0

 = The write operation completed successfully

bit 12

 Program Only Enable bit

1

 = Write operation is executed without erasing target address(es) first

0

 = Automatic erase-before-write: write operations are preceded automatically by an erase of target

address(es)

bit 11-7

 Read as ‘0’

bit 6

 Erase Operation Select bit

1

 = Perform an erase operation when WR is set

0

 = Perform a write operation when WR is set

bit 5-0

 Programming Operation Command Byte bits

Erase Operations (when ERASE bit is ‘1’):
011010

 = Erase 8 words

011001

 = Erase 4 words

011000

 = Erase 1 word 

0100xx

 = Erase entire data EEPROM

Programming Operations (when ERASE bit is ‘0’):
001xx

 = Write 1 word