ST72411R datasheet(64/71 Pages) STMICROELECTRONICS

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ST72411R

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8 DEVICE CONFIGURATION

Each device is available for production in user pro-

grammable versions (FLASH) as well as in factory

coded versions (ROM). FLASH devices are

shipped to customers with a default content (FFh),

while ROM factory coded parts contain the code

supplied by the customer. This implies that FLASH

devices have to be configured by the customer us-

ing the Option Bytes while the ROM devices are

factory-configured.

8.1 OPTION BYTE

The option byte allows the hardware configuration

of the microcontroller to be selected.

The option bytes have 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 FLASH is

fixed to FFh.

In masked ROM devices, the option bytes are

fixed in hardware by the ROM code (see option

list).

Bit 7:1 = Reserved, must always be 1.

Bit 0 = FMP

Full memory protection.

This option bit enables or disables external access

to the internal program memory (read-out protec-

tion). Clearing this bit causes the erasing (to 00h)

of the whole memory (including the option byte).

0: Program memory not read-out protected

1: Program memory read-out protected

OPTI ON BYTE

Reserved

FMP

Default

Value

111

ST72411R 데이터시트(PDF) 64 Page - STMicroelectronics