ST7262 datasheet(128/139 Pages) STMICROELECTRONICS

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14 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in user pro-

grammable versions (FLASH) as well as in factory

coded versions (ROM).

ST7262 devices are ROM versions.

ST72F62 FLASH devices are shipped to custom-

ers with a default content (FFh). This implies that

FLASH devices have to be configured by the cus-

tomer using the Option Byte while the ROM devic-

es are factory-configured.

14.1 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 content of the FLASH is fixed to FFh.

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

default value.

Bits 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 = NEST

This option bit selects the nested interrupts fea-

ture.

0: Nested interrupt feature disabled

1: Nested interrupt feature enabled

Bit 3 = LVD Low Voltage Detector selection

This option bit selects the LVD.

0: LVD enabled

1: LVD disabled

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 Memory Readout Protection

Readout protection, when selected provides a pro-

tection against program memory content extrac-

tion and against write access to Flash memory.

Erasing the option bytes when the FMP_R option

is selected will cause the whole memory to be

erased first and the device can be reprogrammed.

Refer to the ST7 Flash Programming Reference

Manual and section 4.3.1 on page 14 for more de-

tails.

0: Read-out protection enabled

1: Read-out protection disabled

14.2 DEVICE ORDERING INFORMATION AND TRANSFER OF CUSTOMER CODE

Customer code is made up of the ROM contents

and the list of the selected options (if any). 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 un-

used 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.

WDG

NEST LVD

OSC

12/6

FMP_

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