PIC12F683 datasheet(67/148 Pages) MICROCHIP

67 / 148 page

 2004 Microchip Technology Inc.

Preliminary

DS41211B-page 65

PIC12F683

10.0

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. There are four SFRs used to read

and write this memory:

• EECON1

• EECON2 (not a physically implemented register)

• EEDAT

• EEADR

EEDAT holds the 8-bit data for read/write and EEADR

holds the address of the EEPROM location being

accessed. PIC12F683 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 in

Section 15.0 “Electrical Specifications” for exact

limits.

When the data memory is code protected, the CPU

may continue to read and write the data EEPROM

memory. The device programmer can no longer access

the data EEPROM data and will read zeroes.

Additional information on the data EEPROM is

available in the “PICmicro® Mid-Range MCU Family

Reference Manual” (DS33023).

EEDAT – EEPROM DATA REGISTER (ADDRESS: 9Ah)

EEADR – EEPROM ADDRESS REGISTER (ADDRESS: 9Bh)

R/W-0

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 bits

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-0

EEADR7

EEADR6

EEADR5

EEADR4

EEADR3

EEADR2 EEADR1

EEADR0

bit 7

bit 0

bit 7-0

EEADR: Specifies One of 256 Locations for EEPROM Read/Write Operation bits

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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