ST7263BEx datasheet(172/186 Pages) STMICROELECTRONICS

172 / 186 page

Device configuration and ordering information

ST7263Bxx

172/186

Doc ID 7516 Rev 8

Device configuration and ordering information

Each device is available for production in user programmable versions (High Density

FLASH).

ST72F63B FLASH devices are shipped to customers with a default content (FFh).

This implies that FLASH devices have to be configured by the customer using the Option

Byte while the ROM devices are factory-configured.

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 F7h. This means that all the options have “1” as their default value, except

LVD.

In ROM devices, the Option Byte is fixed in hardware by the ROM code.

Option Byte

WDG SW

WD HALT

LVD

OSC 24/12

FMP_R

OPT 7:6 Reserved

OPT 5 WDGSW Hardware or Software Watchdog

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

Note: Important: on ST7263BK1M1, ST7263BK2M1, ST7263BK2B1, and

ST7263BK2B1 ROM devices, this option bit is forced by ST to 0 (LVD

always enabled).

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