ST7261 datasheet(69/80 Pages) STMICROELECTRONICS

69 / 80 page

ST7261

69/80

13 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in ROM

versions.

The

user

programmable

version

(FLASH) is supported by the ST72F623F2.

The ROM devices are factory-configured.

The ROM contents are to be sent on diskette, or

by electronic means, with the hexadecimal file in

.S19 format generated by the development 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.

Refer to application note AN1635 for information

on the counter listing returned by ST after code

has been transferred.

The STMicroelectronics Sales Organization will be

pleased to provide detailed information on con-

tractual points.

13.1 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.

OPTION BYTE

Bit 7:6 = Reserved.

Bit 5 = WDGSW

Hardware or software watchdog

This option bit selects the watchdog type.

0: Hardware enabled

1: Software enabled

Bit 4 = Reserved

Bit 3 = LVD

Low Voltage Detector selection

This option bit selects the LVD.

0: LVD enabled

1: LVD disabled

Note: When the USB interface is used, it is recom-

mended to activate the LVD.

Bit 2= Reserved.

Bit 1 = OSC12/6

Oscillator selection

This option bit selects the clock divider used to

drive the USB interface at 6MHz.

0: 6 MHz oscillator (no divider for USB)

1: 12 Mhz oscillator (2 divider for USB)

Bit 0 = FMP_R

Read out protection

This option bit allows the protection of the software

contents against piracy (program or data). When

the protection is activated, read/write access is

prevented by hardware. If the protection is deacti-

vated, the memory is erased first and the device

can be reprogrammed. Refer to the ST7 Flash

Programming Reference Manual.

0: Read-out protection enabled

1: Read-out protection disabled

WDG

LVD

OSC

12/6

FMP_

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