ST72344S2 datasheet(29/247 Pages) STMICROELECTRONICS

29 / 247 page

ST72344xx, ST2345xx

Flash program memory

Doc ID 12321 Rev 6

29/247

to isolate the application reset circuit in this case. When using a classical RC network with

R>1,000 or a reset management IC with open drain output and pull-up resistor>1,000, no

additional components are needed. In all cases the user must ensure that no external reset

is generated by the application during the ICC session.

The use of Pin 7 of the ICC connector depends on the Programming Tool architecture. This

pin must be connected when using most ST Programming Tools (it is used to monitor the

application power supply). Please refer to the Programming Tool manual.

Pin 9 has to be connected to the OSC1 pin of the ST7 when the clock is not available in the

application or if the selected clock option is not programmed in the option byte. ST7 devices

with multi-oscillator capability need to have OSC2 grounded in this case.

In “enabled option byte” mode (38-pulse ICC mode), the internal RC oscillator is forced as a

clock source, regardless of the selection in the option byte.

Caution:

During normal operation, the ICCCLK pin must be internally or externally pulled- up

(external pull-up of 10 k

Ω mandatory in noisy environment) to avoid entering ICC mode

unexpectedly during a reset. In the application, even if the pin is configured as an output,

any reset will put it back in input pull-up.

Figure 6.

Typical ICC interface

4.5

Memory protection

There are two different types of memory protection: Read Out Protection and Write/Erase

Protection which can be applied individually.

4.5.1

Readout protection

Readout protection, when selected, provides a protection against program memory content

extraction and against write access to Flash memory. Even if no protection can be

considered as totally unbreakable, the feature provides a very high level of protection for a

general purpose microcontroller. Both program and data E2 memory are protected.

ICC CONNECTOR

HE10 CONNECTOR TYPE

APPLICATION

POWER SUPPLY

PROGRAMMING TOOL

ICC CONNECTOR

APPLICATION BOARD

ICC Cable

(See Note 3)

10k

ST7

CL2

CL1

OPTIONAL

See Note 1

See Note 2

APPLICATION

RESET SOURCE

APPLICATION

I/O

(See Note 4)

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