ST72321R7-Auto datasheet(224/243 Pages) STMICROELECTRONICS

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Device configuration and ordering information

ST72321xx-Auto

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Doc ID 13829 Rev 1

Table 141.

Option byte 0 bit description

Bit

Name

Function

OPT7

WDG HALT

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

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

Reserved, must be kept at default value.

OPT4:3

VD[1:0]

Voltage detection

These option bits enable the voltage detection block (LVD and AVD)

with a selected threshold for the LVD and AVD (EVD + AVD).

00: Selected LVD = Highest threshold (VDD~4V)

01: Selected LVD = Medium threshold (VDD~3.5V)

10: Selected LVD = Lowest threshold (VDD~3V)

11: LVD and AVD off

Caution: If the medium or low thresholds are selected, the detection

may occur outside the specified operating voltage range. Below 3.8V,

device operation is not guaranteed. For details on the AVD and LVD

threshold levels refer to Table 19.3.2: Operating conditions with low

voltage detector (LVD).

OPT2

Reserved, must be kept at default value.

OPT1

PKG0

Package selection bit 0

This option bit is used with the PKG1 bit to select the package (see

Table 143: Package selection (OPT7)).

OPT0

FMP_R

Flash memory readout protection

Readout protection, when selected, provides a protection against

program memory content extraction and against write access to Flash

memory.

Erasing the option bytes when the FMP_R option is selected causes

the whole user memory to be erased first, after which the device can

be reprogrammed. Refer to Section 4.3.1: Readout protection on

page 30 and the ST7 Flash Programming Reference Manual for more

details.

Note: Readout protection is not supported if LVD is enabled.

0: Readout protection enabled

1: Readout protection disabled

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