MAS6502 datasheet(10/20 Pages) MAS

10 / 20 page

DA6502.008

29 November 2012

10 (20)

EEPROM SPECIAL FUNCTIONS

functions that includes EEPROM block erase, write

and test functions. See table 5. The EEPROM

control register functions are not needed in normal

EEPROM use such as read and write operations.

The 256-bit EEPROM consists of two 128-bit

blocks, so block erase and block write applies only

to one half of the EEPROM, selectable by the A4

address bit (see table 1). To erase or write the

whole EEPROM, block erase or write needs to be

done

twice:

for

A4=0

and

for

A4=1.

recommended to not use block erase or write

functions to avoid accidental internal oscillator

trimming data overwriting at A4=0 memory block.

Setting the EEPROM control register bit 7 (EBE) to

1 will erase the EEPROM memory block (128 bits)

specified by the A4 bit. Erased memory block

consists of zeroes.

Setting bit 6 (EBW) to 1 will force the EEPROM

memory block specified by the A4 bit to be

programmed to the same 8-bit word found in the

EEPROM data input register (39HEX).

Note: after block operations the block erase (EBE)

or write (EBW) control bit need to be written back to

value 0 to return normal operation.

Table 5. MAS6502 EEPROM control register (3AHEX)

Bit Number

Bit Name

Description

Value

Function

EBE

EEPROM Block Erase

Erase 128-bit block of EEPROM

EBW

EEPROM Block Write

Write EEPROM data input

block of EEPROM

EETEST

EEPROM Test Mode

Enable

Test mode enabled

4-3

VEE[1:0]

EEPROM test read

mode selection

Internal high test read

Internal low test read

FORBIDDEN

CPTEST

Charge pump test

input pin

Programming allowed

Output protection of CP disabled

DMA

Direct Memory Access

TBD

PARITY

Parity Access

TBD

TBD = To be defined

The MAS6502 EEPROM status register (3CHEX), bits (7:6), reflect the EEPROM operation status. See table 6.

This register can be used to verify that the EEPROM operation has been accomplished without errors.

Table 6. MAS6502 EEPROM status register (3CHEX). Only bits (7:6) are used.

Bit Number

Bit Name

Description

Value

Function

ERROR

EEPROM error

detection

No errors

1 (or more) data error(s)

DED

EEPROM double

error detection

No errors

2 (or more) data errors

5-0

X = Don’t care

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