ST7LITE20F2 datasheet(150/166 Pages) STMICROELECTRONICS

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Device configuration

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Doc ID 8349 Rev 5

Device configuration

Each device is available for production in user programmable versions (FLASH) as well as in

factory coded versions (FASTROM).

ST7FLITE2 devices are FLASH versions. ST7PLITE2 devices are Factory Advanced

Service Technique ROM (FASTROM) versions: they are factory programmed FLASH

devices.

ST7FLITE2 devices are shipped to customers with a default program memory content

(FFh), while FASTROM factory coded parts contain the code supplied by the customer. This

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

while the FASTROM devices are factory configured.

15.1

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).

15.1.1

Option byte 0

●

OPT7 = Reserved, must always be 1

●

OPT6:4 =

OSCRANGE[2:0] Oscillator range

When the internal RC oscillator is not selected (Option OSC=1), these option bits

select the range of the resonator oscillator current source or the external clock source.

Note:

When the internal RC oscillator is selected, the OSCRANGE option bits must be kept at

their default value in order to select the 256 clock cycle delay (see Section 7.5: Reset

sequence manager (RSM)).

●

OPT3:2 =

SEC[1:0] Sector 0 size definition

These option bits indicate the size of sector 0 according to Table 93.

Table 92.

Option bytes values

OSCRANGE

Typ.

frequency range with

Resonator

1~2MHz

2~4MHz

4~8MHz

8~16MHz

VLP

32.768kHz

External

Clock source:

CLKIN

on OSC1

on PB4

Reserved

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