ST7FOXU0 datasheet(110/123 Pages) STMICROELECTRONICS

110 / 123 page

Device configuration and ordering information

ST7FOXU0

110/123

Device configuration and ordering information

This device is available for production in user programmable version (Flash).

ST7FOX XFlash devices are shipped to customers with a default program memory content

(FFh).

13.1

Option bytes

The two 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).

13.1.1

ST7FOXU0 Option byte 1

Bits 7:6 = CKSEL[1:0] Start-up clock selection.

These bits are used to select the startup frequency. By default, the internal RC is

selected.

Bit 5 = Reserved, must always be 1.

Bit 4 = Reserved, must always be 0.

Bit 3 = Reserved, must always be 1

Bit 2 = LVD Low Voltage Detection selection.

This option bit enables the low voltage detection block (LVD).

0: LVD on

1: LVD off (default value)

Bit 1 = 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)

Bit 0 = 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 60.

Startup clock selection

Configuration

CKSEL1

CKSEL0

Internal RC as Startup Clock

AWU RC as a Startup Clock

Reserved

External Clock on pin PA5

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