PIC12F635ESS datasheet(93/234 Pages) MICROCHIP

93 / 234 page

DS41232D-page 91

PIC12F635/PIC16F636/639

9.0

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. PIC16F636/639 has 256 bytes of data

EEPROM and the PIC12F635 has 128 bytes.

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 A/C 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.

EEDAT: EEPROM DATA REGISTER

R/W-0

EEDAT7

EEDAT6

EEDAT5

EEDAT4

EEDAT3

EEDAT2

EEDAT1

EEDAT0

bit 7

bit 0

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

bit 7-0

EEDATn: Byte Value to Write To or Read From Data EEPROM bits

EEADR: EEPROM ADDRESS REGISTER

R/W-0

EEADR7(1)

EEADR6

EEADR5

EEADR4

EEADR3

EEADR2

EEADR1

EEADR0

bit 7

bit 0

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

bit 7-0

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

Note 1:

PIC16F636/639 only. Read as ‘0’ on PIC12F635.

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