ST7LUS5 datasheet(115/124 Pages) STMICROELECTRONICS

115 / 124 page

ST7LUS5, ST7LU05, ST7LU09

Device configuration and ordering information

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Option byte 1

OPT1

FMP_R

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 will cause the

whole memory to be erased first, and the device can be reprogrammed.

Refer to Section 4.5 and the ST7 Flash Programming Reference Manual

for more details.

0: Readout protection off

1: Readout protection on

OPT0

FMP_W

Flash write protection

This option indicates if the Flash program memory is write protected.

0: Write protection off

1: Write protection on

Warning: When this option is selected, the program memory (and the

option bit itself) can never be erased or programmed again.

Table 89.

Option byte 1 bit description

Bit

Name

Function

OPT7:6 CKSEL[1:0]

Start-up clock selection.

These option bits are used to select the startup frequency. By default, the

internal RC is selected.

00: Internal RC as startup clock

01: AWU RC as a startup clock

10: Reserved

11: External clock on pin PA5

OPT5

Reserved, must always be 1

OPT4

Reserved, must always be 0

OPT3:2

LVD[1:0]

Low Voltage Detection selection

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

follows:

10: Highest voltage threshold

11: LVD off

OPT1

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)

OPT0

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

Table 88.

Option byte 0 bit description (continued)

Bit

Name

Function

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