ST7LITE39 datasheet(158/167 Pages) STMICROELECTRONICS

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ST7LITE3

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15 DEVICE CONFIGURATION

Each device is available for production in user pro-

grammable versions (FLASH) as well as in factory

coded versions (ROM/FASTROM).

ST7PLITE3 devices are Factory Advanced Serv-

ice Technique ROM (FASTROM) versions: they

are factory programmed FLASH devices.

ST7FLITE3 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 us-

ing the Option Bytes.

15.1 FLASH OPTION BYTES

The two option bytes allow the hardware configu-

ration of the microcontroller to be selected.

OPTION BYTE 0

OPT7 = AWUCK Auto Wake Up Clock Selection

0: 32-KHz Oscillator (VLP) selected as AWU clock

1: AWU RC Oscillator selected as AWU clock.

Note: If this bit is reset, internal RC oscillator must

be selected (Option OSC=0).

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: OSCRANGE[2:0] has no effect when

AWUCK option is set to 0. In this case, the VLP os-

cillator range is automatically selected as AWU

clock.

OPT 3:2 = 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

Readout protection, when selected provides a pro-

tection against program memory content extrac-

tion 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 the ST7 Flash Programming Reference

Manual and section 4.5 on page 13 for more de-

tails

0: Read-out protection off

1: Read-out protection on

OPT 0 = 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

The option bytes have no address in the memory

map and can be accessed only in programming

mode (for example using a standard ST7 program-

ming tool). The default content of the FLASH is

fixed to FFh.

OSCRANGE

Typ.

frequency

range with

Resonator

1~2MHz

2~4MHz

4~8MHz

8~16MHz

VLP 32.768kHz

External Clock on OSC1

Reserved

External Clock on PB4

Sector 0 Size

SEC1

SEC0

0.5k

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