PIC16F-ESLASHML datasheet(91/178 Pages) MICROCHIP

91 / 178 page

DS40044F-page 89

PIC16F627A/628A/648A

13.0

DATA EEPROM MEMORY

The EEPROM data memory is readable and writable

during normal operation (full VDD 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. The 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. A

device programmer can no longer access this memory.

Additional information on the data EEPROM is

available in the PIC® Mid-Range Reference Manual

(DS33023).

EEDATA – EEPROM DATA REGISTER (ADDRESS: 9Ah)

EEADR – EEPROM ADDRESS 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 (128-255) 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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