ST7LITE20 datasheet(123/131 Pages) STMICROELECTRONICS

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15 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in a user

programmable version (FLASH). 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 two option bytes allow the hardware configu-

ration of the microcontroller to be selected.

The option bytes can be accessed only in pro-

gramming mode (for example using a standard

ST7 programming tool).

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 ex-

ternal 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).

OPT3:2 = SEC[1:0]

Sector 0 size definition

These option bits indicate the size of sector 0 ac-

cording to the following table.

OPT1 = FMP_R

Read-out protection

This option indicates if the FLASH program mem-

ory and Data EEPROM is protected against pira-

cy. The read-out protection blocks access to the

program and data areas in any mode except user

mode and IAP mode. 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 the ST7 Flash

Programming Reference Manual and section 4.5

on page 14 for more details

0: Read-out protection off

1: Read-out protection on

OPT0 = FMP_W

FLASH write protection

This option indicates if the FLASH program mem-

ory is write protected.

Warning: When this option is selected, the pro-

gram memory (and the option bit itself) can never

be erased or programmed again.

0: Write protection off

1: Write protection on

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

Sector 0 Size

SEC1

SEC0

0.5k

OPTION BYTE 0

OPTION BYTE 1

Res.

OSCRANGE

2:0

SEC1 SEC0

FMP

PLL

x4x8

PLL

OFF

PLL32

OFF

OSC LVD1 LVD0

WDG

HALT

Default

Value

1111

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