ST7LITEUSX datasheet(95/108 Pages) STMICROELECTRONICS

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ST7LITEUSx

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14 DEVICE CONFIGURATION AND ORDERING INFORMATION

Each device is available for production in user pro-

grammable versions (FLASH) as well as in factory

coded versions (FASTROM).

ST7PLITEUS2 and ST7PLITEUS5 devices are

Factory Advanced Service Technique ROM (FAS-

TROM) versions: they are factory-programmed

XFlash devices.

ST7FLITEUS2 and ST7FLITEUS5 XFlash devices

are shipped to customers with a default program

memory content (FFh).

The FASTROM factory coded parts contain the

code supplied by the customer. This implies that

FLASH devices have to be configured by the cus-

tomer using the Option Bytes while the FASTROM

devices are factory-configured.

14.1 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 1

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

This bit is 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.

Bits 3:2 = LVD[1:0] Low Voltage Detection selec-

tion

These option bits enable the LVD block with a se-

lected threshold as shown in Table 23.

Table 23. LVD Threshold Configuration

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

OPTION BYTE 0

Bits 7:4 = Reserved, must always be 1.

Bit 3 = Reserved, must always be 0.

Bit 2 = SEC0 Sector 0 size definition

This option bit indicates the size of sector 0 ac-

cording to the following table.

Bit 1 = 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 Section 4.5 and the ST7 Flash Program-

ming Reference Manual for more details.

0: Read-out protection off

1: Read-out protection on

Bit 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

Configuration

CKSEL1 CKSEL0

Internal RC as Startup Clock

AWU RC as a Startup Clock

Reserved

External Clock on pin PA5

Configuration

LVD1 LVD0

LVD Off

Highest Voltage Threshold

Medium Voltage Threshold

Lowest Voltage Threshold

Sector 0 Size

SEC0

0.5k

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