ST7FOXU0 datasheet(17/123 Pages) STMICROELECTRONICS

17 / 123 page

ST7FOXU0

Flash programmable memory

17/123

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, 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

●

ICCDATA: ICC input serial data pin

●

OSC1: main clock input for external source

●

VDD: application board power supply (optional, see Note 3)

Note:

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.

During the ICP session, the programming tool must control the RESET pin. This can lead to

conflicts between the programming tool and the application reset circuit if it drives more than

5mA at high level (push pull output or pull-up resistor<1 k

Ω). A schottky diode can be used

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

R>1 k

Ω or a reset management IC with open drain output and pull-up resistor>1 kΩ, 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.

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. In “disabled option byte” mode

(35-pulse ICC mode), pin 9 has to be connected to the CLKIN 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.

A serial resistor must be connected to ICC connector pin 6 in order to prevent contention on

PA3/RESET pin. Contention may occur if a tool forces a state on RESET pin while PA3 pin

forces the opposite state in output mode. The resistor value is defined to limit the current

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