ST72344 datasheet(181/191 Pages) STMICROELECTRONICS

181 / 191 page

ST72340, ST72344, ST72345

181/191

15 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).

ST7P234x devices are Factory Advanced Service

Technique ROM (FASTROM) versions: they are

factory-programmed XFlash devices.

ST72F34x FLASH devices are shipped to custom-

ers with a default content (FFh). This implies that

FLASH devices have to be configured by the cus-

tomer using the Option Bytes.

15.1 OPTION BYTES

The four 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 = 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

OPT6 = 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)

OPT5:4 = LVD[1:0] Low voltage detection selec-

tion

These option bits enable the LVD block with a se-

lected threshold as shown in Table 31.

Table 31. LVD Threshold Configuration

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

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 17 for more de-

tails

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

Configuration

LVD1 LVD0

LVD Off

Highest Voltage Threshold (

∼4.1V)

Medium Voltage Threshold (

∼3.5V)

Lowest Voltage Threshold (

∼2.8V)

Sector 0 Size

SEC1

SEC0

0.5k

OPTION BYTE 0

OPTION BYTE 1

WDG

HALT

WDG

LVD1 LVD0 SEC1 SEC0

FMP

RST

OSCRANGE

2:0

OSC

DIV2

PLL

x4x8

PLL

OFF

Default

Value

1111

1011

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