ST7263B datasheet(124/132 Pages) STMICROELECTRONICS

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ST7263B

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15 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in ROM

versions, in user programmable versions (FLASH)

as well as in factory coded versions (FASTROM).

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 con-

figured by the customer using the Option Byte

while the ROM devices are factory-configured.

The FASTROM or ROM contents are to be sent on

diskette, or by electronic means, with the hexadec-

imal file in .S19 format generated by the develop-

ment tool. All unused bytes must be set to FFh.

The selected options are communicated to STMi-

croelectronics using the correctly completed OP-

TION LIST appended.

The STMicroelectronics Sales Organization will be

pleased to provide detailed information on con-

tractual points.

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 FFh.

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

default value.

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

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 piracy. This protection

is based on a read and write protection of the

memory in test modes and IAP. Erasing the option

bytes when the FMP_R option is selected, causes

the whole user memory to be erased first.

0: Read-out protection enabled

1: Read-out protection disabled

WDG

HALT

LVD

OSC

24/12

FMP_

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