ST72334J2TASLASHXXX datasheet(22/150 Pages) STMICROELECTRONICS

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ST72334xx-Auto, ST72314xx-Auto, ST72124Jx-Auto

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DATA EEPROM (Cont’d)

6.6 REGISTER DESCRIPTION

CONTROL/STATUS REGISTER (CSR)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:3 = Reserved, forced by hardware to 0.

Bit 2 = IE Interrupt enable

This bit is set and cleared by software. It enables the

Data EEPROM interrupt capability when the PGM

bit is cleared by hardware. The interrupt request is

automatically cleared when the software enters the

interrupt routine.

0: Interrupt disabled

1: Interrupt enabled

Bit 1 = LAT Latch Access Transfer

This bit is set by software. It is cleared by hard-

ware at the end of the programming cycle. It can

only be cleared by software if PGM bit is cleared.

0: Read mode

1: Write mode

Bit 0 = PGM Programming control and status

This bit is set by software to begin the programming

cycle. At the end of the programming cycle, this bit

is cleared by hardware and an interrupt is generated

if the ITE bit is set.

0: Programming finished or not yet started

1: Programming cycle is in progress

Note: if the PGM bit is cleared during the program-

ming cycle, the memory data is not guaranteed

Table 3. Data EEPROM Register Map and Reset Values

6.7 READOUT PROTECTION OPTION

The Data EEPROM can be optionally readout pro-

tected in ST72334 ROM devices (see option list on

page 145

). ST72C334 Flash devices do not have

this protection option.

LAT

PGM

Address

(Hex.)

Label

002Ch

EECSR

Reset Value

RWM

PGM

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