ST72260G datasheet(157/171 Pages) STMICROELECTRONICS

157 / 171 page

ST72260G, ST72262G, ST72264G

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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 (ROM/FASTROM).

ST7226x devices are ROM versions. ST72P26x

devices are Factory Advanced Service Technique

ROM (FASTROM) versions: they are factory-pro-

grammed XFlash devices.

ST72F26x XFlash devices are shipped to custom-

ers with a default program memory content (FFh).

The option bytes are programmed to enable the in-

ternal RC oscillator. The ROM/FASTROM factory

coded parts contain the code supplied by the cus-

tomer. This implies that FLASH devices have to be

configured by the customer using the Option Bytes

while the ROM/FASTROM devices are factory-

configured.

15.1 OPTION BYTES

The two option bytes allow the hardware configu-

ration of the microcontroller to be selected.

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.

In masked ROM devices, the option bytes are

fixed in hardware by the ROM code (see option

list).

USER OPTION BYTE 0

OPT 7 = 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

OPT 6 = WDG SW

Hardware or software watch-

dog

This option bit selects the watchdog type.

0: Hardware (watchdog always enabled)

1: Software (watchdog to be enabled by software)

OPT 5:4 = VD[1:0]

Voltage detection selection

These option bits enable the voltage detection

block (LVD and AVD) with a selected threshold ot

the LVD and AVD.

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.

OPT 1 = FMP_R

Read-out protection

This option indicates if the program memory is pro-

tected against piracy See “Memory Protection” on

page 16.. The read-out protection blocks access

to the program memory 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 Section 4.5 and

the ST7 Flash Programming Reference Manual for

more details.

0: Read-out protection off

1: Read-out protection on

Configuration

VD1

VD0

LVD Off

Lowest Voltage Threshold (

∼3.05V)

Medium Voltage Threshold (

∼3.6V)

Highest Voltage Threshold (

∼4.1V)

Sector 0 Size

SEC1

SEC0

0.5k

USER OPTION BYTE 0

USER OPTION BYTE 1

WDG

HALT

WDG

VD1

VD0

SEC

FMP

EXTIT CSS

OSC

TYPE

OSC

TYPE

OSC

RNGE

OSC

RNGE

OSC

RNGE

PLL

OFF

Default

Value

111

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