ST72F521M datasheet(191/199 Pages) STMICROELECTRONICS

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ST72521M/R/AR

191/199

14 ST72521M/(A)R 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). FLASH devices are

shipped to customers with a default content, while

ROM factory coded parts contain the code sup-

plied by the customer. This implies that FLASH de-

vices have to be configured by the customer using

the Option Bytes while the ROM devices are facto-

ry-configured.

14.1 FLASH OPTION BYTES

The option bytes allow the hardware configuration

of the microcontroller to be selected. They have no

address in the memory map and can be accessed

only in programming mode (for example using a

standard ST7 programming tool). The default con-

tent of the FLASH is fixed to FFh. To program the

FLASH devices directly using ICP, FLASH devices

are shipped to customers with the internal RC

clock source. In masked ROM devices, the option

bytes are fixed in hardware by the ROM code (see

option list).

OPTION BYTE 0

OPT7= WDG HALT

Watchdog and HALT mode

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 = CSS

Clock security system on/off

This option bit enables or disables the clock secu-

rity system function (CSS) which includes the

clock filter and the backup safe oscillator.

0: CSS enabled

1: CSS disabled

OPT4:3= VD[1:0]

Voltage detection

These option bits enable the voltage detection

block (LVD, and AVD) with a selected threshold for

the LVD and AVD (EVD+AVD).

Note: For details on the AVD and LVD threshold

levels refer to Section 12.3.2 on page 157

STATIC OPTION BYTE 0

STATIC OPTION BYTE 1

WDG

OSCTYPE

OSCRANGE

Default

1100

Selected Low Voltage Detector

VD1

VD0

LVD and AVD Off

Not Used (Lowest Threshold: (VDD~3V)

Not Used (Med. Threshold VDD~3.5V)

Highest Voltage Threshold (VDD~4V)

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