ST7L09 datasheet(96/104 Pages) STMICROELECTRONICS

96 / 104 page

ST7L05, ST7L09

96/104

15 DEVICE CONFIGURATION AND ORDERING INFORMATION

15.1 INTRODUCTION

Each device is available for production in user pro-

grammable versions (Flash) as well as in factory

coded versions (FASTROM).

The ST7PL0x device is a Factory Advanced Serv-

ice Technique ROM (FASTROM) version: It is a

factory-programmed XFlash device.

The ST7FL0x XFlash device is shipped to custom-

ers with a default program memory content (FFh).

The OSC option bit is programmed to 0 by default.

The FASTROM factory coded parts contain the

code supplied by the customer. This implies that

Flash devices have to be configured by the cus-

tomer using the Option Bytes while the FASTROM

devices are factory-configured.

15.2 OPTION BYTES

The two option bytes allow the hardware configu-

ration of the microcontroller to be selected.

The option bytes can be accessed only in pro-

gramming mode (for example, using a standard

ST7 programming tool).

OPTION BYTE 0

Bits 7:4 = Reserved, must always be 1

Bits 3:2 = SEC[1:0] Sector 0 size definition

These option bits indicate the size of sector 0 ac-

cording to the following table:

Bit 1 = FMP_R Read-out protection

Read-out protection, when selected provides a

protection against program memory content ex-

traction and against write access to Flash memo-

ry. Erasing the option bytes when the FMP_R op-

tion is selected will cause the whole memory to be

erased first, and the device can be reprogrammed.

Refer to Section 4.5 and the ST7 Flash Program-

ming Reference Manual for more details.

0: Read-out protection off

1: Read-out protection on

Bit 0 = FMP_W FLASH write protection

This option indicates if the Flash program memory

is write protected.

Warning: When this option is selected, the pro-

gram memory (and the option bit itself) can never

be erased or programmed again.

0: Write protection off

1: Write protection on

Sector 0 Size

SEC1

SEC0

0.5k

1.5k

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