ST7260 datasheet(107/117 Pages) STMICROELECTRONICS

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ST7260

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15 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in user pro-

grammable versions (High Density FLASH) as

well as in factory coded versions (FASTROM).

ST72P60 devices are Factory Advanced Service

Technique ROM (FASTROM) versions: they are

factory programmed FLASH devices.

ST72F60 FLASH devices are shipped to custom-

ers with a default content (FFh).

This implies that FLASH devices have to be con-

figured by the customer using the Option Byte

while the ROM devices are factory-configured.

15.1 OPTION BYTE

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 using a standard ST7 programming tool.

The default contents of the FLASH is fixed to F7h.

This means that all the options have “1” as their

default value, except LVD.

In ROM devices, the Option Byte is fixed in hard-

ware by the ROM code.

OPTION BYTE

OPT 7:6 = Reserved.

OPT 5 = WDGSW Hardware or Software Watch-

dog

This option bit selects the watchdog type.

0: Hardware enabled

1: Software enabled

OPT 4 = WDHALT 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

OPT 3 = LVD Low Voltage Detector selection

This option bit selects the LVD.

0: LVD enabled

1: LVD disabled

Important note: on ROM devices this option bit is

forced by ST to 0 (LVD always enabled):

OPT 2 = Reserved.

OPT 1 = OSC24/12 Oscillator Selection

This option bit selects the clock divider used to

drive the USB interface at 6MHz.

0: 24 MHz oscillator

1: 12 Mhz oscillator

OPT 0 = FMP_R Flash memory read-out protec-

tion

This option indicates if the user flash memory is

protected against read-out. Read-out protection,

when selected, provides a protection against Pro-

gram Memory content extraction and against write

access to Flash memory. Erasing the option bytes

when the FMP_R option is selected, causes the

whole user memory to be erased first and the de-

vice can be reprogrammed. Refer to the ST7 Flash

Programming Reference Manual and section 4.3.1

on page 14 for more details.

0: Read-out protection enabled

1: Read-out protection disabled

WDG

HALT

LVD

OSC

24/12

FMP_

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