ST7FLCD1 datasheet(29/95 Pages) STMICROELECTRONICS

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ST7FLCD1

Flash Program Memory

5.5

In-Circuit Programming (ICP)

To perform In-Circuit Programming (ICP), the microcontroller must be switched to ICC (In-Circuit

Communication) mode by an external controller or programming tool.

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

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

interface for downloading).

When using a STMicroelectronics or third-party programming tool that supports ICP and the

specific microcontroller device, the user only needs to implement the ICP hardware interface on the

application board (see Figure 12). For more details on the pin locations, refer to the device pin

description.

ICP needs between 4 and 6 pins to be connected to the programming tool. Depending on the

desired type of programming, these pins are:

● RESET: device reset

● VSS: device power supply ground

● ICC_CLK: ICC output serial clock pin

● ICC_DATA: ICC input serial data pin

● VPP: programming voltage

● VDD: application board power supply

CAUTION:

1. If the ICC_CLK or ICC_DATA 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 ICC_CLK and ICC_DATA pins are not available for the

application. If they are used as inputs by the application, an 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.

2. During the ICC 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

5 mA 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 a

resistor (> 1 k

Ω) or a reset management IC with open-drain output and pull-up resistor

Figure 11: Memory Map and Sector Address

Sector 1

Sector 0

Sector 2

60 KBytes

DV Flash

FFFFh

EFFFh

DFFFh

1000h

Memory Size

52 KBytes

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