PIC16F628-20SLASHSS datasheet(91/160 Pages) MICROCHIP

91 / 160 page

PIC16F62X

Preliminary

DS40300B-page 91

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. 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. PIC16F62X devices have 128 bytes of data

EEPROM with an address range from 0h to 7Fh.

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 may

continue to read and write the data EEPROM memory.

The device programmer can no longer access

this memory.

Additional information on the Data EEPROM is avail-

able in the PICmicro™ Mid-Range Reference Manual,

(DS33023).

13.1

EEADR

The EEADR register can address up to a maximum of

256 bytes of data EEPROM. Only the first 128 bytes of

data EEPROM are implemented and only seven of the

eight bits in the register (EEADR<6:0>) are required.

The upper bit is address decoded. This means that

this bit should always be ’0’ to ensure that the address

is in the 128 byte memory space.

R/W

—

EADR6

EADR5

EADR4

EADR3

EADR2

EADR1

EADR0

R = Readable bit

W = Writable bit

S = Settable bit

U = Unimplemented bit, read

as ‘0’

-n = Value at POR reset

bit7

bit0

bit 7

Unimplemented Address: Must be set to '0'

bit 6:0

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

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