PIC16F628A-ISLASHML datasheet(91/168 Pages) MICROCHIP

91 / 168 page

 2002 Microchip Technology Inc.

Preliminary

DS40044A-page 89

PIC16F627A/628A/648A

13.0 DATA EEPROM MEMORY

The EEPROM data memory is readable and writable

during normal operation (full V

DD range). This memory

is not directly mapped in the register file space. Instead

it is indirectly addressed through the Special Function

Registers (SFRs). There are four SFRs used to read

and write this memory. These registers are:

•EECON1

• EECON2 (Not a physically implemented register)

•EEDATA

•EEADR

EEDATA holds the 8-bit data for read/write, and

EEADR holds the address of the EEPROM location

being accessed. PIC16F627A/628A devices have 128

bytes of data EEPROM with an address range from 0h

to 7Fh. PIC16F648A device has 256 bytes of data

EEPROM with an address range from 0h to FFh.

The EEPROM data memory allows byte read and write.

A byte write automatically erases the location and

writes the new data (erase before write). The EEPROM

data memory is rated for high erase/write cycles. The

write time is controlled by an on-chip timer. The write-

time will vary with voltage and temperature as well as

from chip to chip. Please refer to AC specifications for

exact limits.

When the device is code protected, the CPU can

continue to read and write the data EEPROM memory.

device

programmer

can

longer

access

this memory.

Additional information on the Data EEPROM is avail-

able in the PICmicro™ Mid-Range Reference Manual,

(DS33023).

EEDATA REGISTER (ADDRESS: 9Ah)

EEADR REGISTER (ADDRESS: 9Bh)

R/W-x

EEDAT7

EEDAT6

EEDAT5

EEDAT4

EEDAT3

EEDAT2

EEDAT1

EEDAT0

bit 7

bit 0

bit 7-0

EEDATn: Byte value to write to or read from Data EEPROM memory location.

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

’1’ = Bit is set

’0’ = Bit is cleared

x = Bit is unknown

R/W-x

EADR7

EADR6

EADR5

EADR4

EADR3

EADR2

EADR1

EADR0

bit 7

bit 0

bit 7

PIC16F627A/628A - Unimplemented Address: Must be set to ‘0’

PIC16F648A - EEADR: Set to ‘1’ specifies top 128 locations (128-256) of EEPROM Read/Write

Operation

bit 6-0

EEADR: Specifies one of 128 locations of EEPROM Read/Write Operation

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

’1’ = Bit is set

’0’ = Bit is cleared

x = Bit is unknown

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