ST7262 datasheet(126/132 Pages) STMICROELECTRONICS

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ST7262

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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/FASTROM).

ST7262 devices are ROM versions. ST72P62 de-

vices are Factory Advanced Service Technique

ROM (FASTROM) versions: they are factory-pro-

grammed HDFlash devices.

ST72F62 FLASH devices are shipped to custom-

ers with a default content (FFh), while FASTROM

factory coded parts contain the code supplied by

the customer. This implies that FLASH devices

have to be configured by the customer using the

Option Byte while the ROM devices 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.

In FASTROM devices, the Option Byte is fixed in

hardware by the FASTROM code.

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

Note: The LVD must be disabled in low voltage

devices.

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)

Note: The 6 MHz oscillator is mandatory in low

voltage devices.

Bit 0 = FMP_R

Memory Readout 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 and section 4.3.1

on page 14 for more details.

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/FAS-

TROM contents and the list of the selected options

(if any). The ROM or FASTROM 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.

WDG

NEST LVD

OSC

12/6

FMP_

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