ST72325AR7-Auto datasheet(228/243 Pages) STMICROELECTRONICS

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Device configuration and ordering information

ST72325xxx-Auto

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Doc ID 13770 Rev 3

Device configuration and ordering information

Each device is available for production in user programmable versions (Flash) as well as in

factory coded versions (FASTROM).

ST72P325 devices are Factory Advanced Service Technique ROM (FASTROM) versions:

They are factory-programmed HDFlash devices. Flash devices are shipped to customers

with a default content, whereas ROM/FASTROM factory coded parts contain the code

supplied by the customer. This implies that Flash devices have to be configured by the

customer using the option bytes while the ROM/FASTROM devices are factory-configured.

Detailed device configuration and ordering information is presented in the following

Section 21.1: Flash devices and Section 21.2: FASTROM device ordering information and

transfer of customer code.

21.1

Flash devices

21.1.1

Flash configuration

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 content 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 enabled. In masked ROM devices, the option

bytes are fixed in hardware by the ROM code (see option list).

Table 144.

Flash option bytes

Static option byte 0

Static option byte 1

6543210

WDG

CSS

Reserved

OSCTYPE

OSCRANGE

HALT

Default

value:

1100111

(1)

Depends on device type as defined in Table 147: Package selection (OPT7) on page 230

Table 145.

Option byte 0 bit description

Bit

Name

Function

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)

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