ST72324BJ2 datasheet(172/188 Pages) STMICROELECTRONICS

172 / 188 page

Device configuration and ordering information

ST72324B

172/188

Device configuration and ordering information

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

factory coded versions (ROM/FASTROM).

ST72324B devices are ROM versions. ST72P324B 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 (FFh), while ROM 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 devices are factory-

configured.

14.1

Flash devices

14.1.1

Flash configuration

Depends on device type as defined in Table 121: Package selection (OPT7) on page 174.

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 directly the Flash devices 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).

Table 118.

Flash option bytes

Static option byte 0

Static option byte 1

5432

WDG

Res

Reserved

PKG1

OSCTYPE

OSCRANGE

HALT

1021

Default

See

note

1001

Table 119.

Option byte 0 bit description

Bit

Name

Function

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

Reserved, must be kept at default value.

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