ST7LUS5 datasheet(19/124 Pages) STMICROELECTRONICS

19 / 124 page

ST7LUS5, ST7LU05, ST7LU09

Flash program memory

19/124

Depending on the ICP driver code downloaded in RAM, Flash memory programming can be

fully customized (number of bytes to program, program locations, or selection of the serial

communication interface for downloading).

4.3.2

In-application programming (IAP)

This mode uses an IAP driver program previously programmed in Sector 0 by the user (in

ICP mode).

This mode is fully controlled by user software. This allows it to be adapted to the user

application (user-defined strategy for entering programming mode or choice of

communications protocol used to fetch the data to be stored, etc.).

IAP mode can be used to program any memory areas except Sector 0, which is write/erase

protected to allow recovery in case errors occur during the programming operation.

4.4

ICC interface

ICP needs a minimum of 4 and up to 6 pins to be connected to the programming tool. These

pins are:

●

RESET:

device reset

●

VSS:

device power supply ground

●

ICCCLK:

ICC output serial clock pin(a)

●

ICCDATA: ICC input serial data pin

●

CLKIN:

main clock input for external source

●

VDD:

application board power supply(b)

If the ICCCLK or ICCDATA pins are only used as outputs in the application, no signal isolation is necessary. As

soon as the programming tool is plugged to the board, even if an ICC session is not in progress, the ICCCLK

and ICCDATA pins are not available for the application. If they are used as inputs by the application, isolation

such as a serial resistor has to be implemented in case another device forces the signal. Refer to the

programming tool documentation for recommended resistor values.

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.

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