ST72344K2 datasheet(232/247 Pages) STMICROELECTRONICS

232 / 247 page

Device configuration and ordering information

ST72344xx, ST2345xx

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Doc ID 12321 Rev 6

Device configuration and ordering information

Each device is available for production in user programmable versions (Flash).

ST72F34x 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 Bytes.

15.1

Option bytes

The four option bytes allow the hardware configuration of the microcontroller to be selected.

The option bytes can be accessed only in programming mode (for example using a standard

ST7 programming tool).

15.1.1

Option byte 0

OPT7 = WDG Halt Watchdog Reset on Halt

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

OPT6 = WDG SW Hardware or Software Watchdog

This option bit selects the watchdog type.

0: Hardware (watchdog always enabled)

1: Software (watchdog to be enabled by software)

OPT5:4 = LVD[1:0] Low voltage detection selection

These option bits enable the LVD block with a selected threshold as shown in

Table 119.

OPT3:2 = SEC[1:0] Sector 0 size definition

These option bits indicate the size of sector 0 according to the following table.

Table 119.

LVD threshold configuration

Configuration

LVD1

LVD0

LVD Off

Highest voltage threshold (

∼4.1V)

Medium voltage threshold (

∼3.5V)

Lowest voltage threshold (

∼2.8V)

Table 120.

Size of sector 0

Sector 0 size

SEC1

SEC0

0.5k

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