ST72321R7-Auto datasheet(223/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

Device configuration and ordering information

Doc ID 13829 Rev 1

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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).

ST72321-Auto devices are ROM versions, ST72P321-Auto 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: ROM 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 140.

Flash option bytes

Static option byte 0

Static option byte 1

6543210

WDG

Res

OSCTYPE

OSCRANGE

HALT

Default

value:

1100111

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