ST72F262G2B6 datasheet(162/172 Pages) STMICROELECTRONICS

162 / 172 page

ST72260Gx, ST72262Gx, ST72264Gx

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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 of

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.

Note 1: 4k available on FASTROM devices only.

OPT 1 = FMP_R Read-out protection

Read-out protection, when selected, provides a

protection against Program Memory content ex-

traction and against write access to Flash memo-

ry.

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

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

4k 1)

USER OPTION BYTE 0

USER OPTION BYTE 1

WDG

HALT

WDG

VD1

VD0

SEC

FMP

EXTIT Res.

OSC

TYPE

OSC

TYPE

OSC

RNGE

OSC

RNGE

OSC

RNGE

PLL

OFF

Default

Value

111111

ST72F262G2B6 Datasheet(PDF) 162 Page - STMicroelectronics

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