ST72311R datasheet(158/164 Pages) STMICROELECTRONICS

158 / 164 page

ST72311R, ST72511R, ST72512R, ST72532R

158/164

14 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in user pro-

grammable versions (OTP) as well as in factory

coded versions (ROM). OTP devices are shipped

to customers with a default content (FFh), while

ROM factory coded parts contain the code sup-

plied by the customer. This implies that OTP de-

vices have to be configured by the customer using

the Option Bytes while the ROM devices are facto-

ry-configured.

14.1 OPTION BYTES

The option byte allows the hardware configuration

of the microcontroller to be selected.

The option byte has no address in the memory

map and can be accessed only in programming

mode (for example using a standard ST7 program-

ming tool). The default content of the OTP is fixed

to FFh. This means that all the options have “1” as

their default value.

In masked ROM devices, the option bytes are

fixed in hardware by the ROM code (see option

list).

USER OPTION BYTE

Bit 7:6,4 = Reserved

, must always be 1.

Bit 5 = Reserved

, must always be 0.

Bit 3 = FMP

Full memory protection

This option bit allows the protection of the software

contents against piracy (program or data). When

the protection is activated, read-out of the EPROM

or data EEPROM contents is prevented by hard-

ware.

0: Read-out protection enabled

1: Read-out protection disabled

Bit 2 = Reserved

, must always be 1

Bit 1 = WDG HALT

Watchdog and HALT mode

This option bit determines if a RESET is generated

when entering HALT mode while the Watchdog is

active.

0: No Reset generation when entering Halt mode

1: Reset generation when entering Halt mode

Bit 0 = WDG SW

Hardware or software watchdog

This option bit selects the watchdog type.

0: Hardware (watchdog always enabled)

1: Software (watchdog to be enabled by software)

USER OPTIO N BYTE

FMP

WDG HALT

WDG SW

Default

Value

1111

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