ST72411R datasheet(11/71 Pages) STMICROELECTRONICS

11 / 71 page

ST72411R

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FLASH PROGRAM MEMORY (Cont’d)

ISP2 Mode

This mode requires five signals (plus the VDD sig-

nal if necessary) to be connected to the program-

ming tool. These signals are:

– RESET: device reset

–VSS: device ground power supply

– ISPCLK2: ISP output serial clock pin

– ISPDATA2: ISP input serial data pin

– ISPSEL: Remote ISP mode selection. This pin

must be left high impedance (internal pull

down on pin ISPSEL) if the internal oscillator

is selected. Otherwise an appropriate pull-up

is needed (see Electrical Characteristics).

If any of these pins are used for other purposes on

the application, a serial resistor has to be imple-

mented to avoid a conflict if the other device forces

the signal level.

Figure 4 shows a typical hardware interface to a

standard ST7 programming tool. For more details

on the pin locations, refer to the device pinout de-

scription.

Figure 4. Typical Remote ISP2 Interface

1.5 Program Memory Read-out Protection

The read-out protection is enabled through an op-

tion bit.

For FLASH devices, when this option is selected,

the program and data stored in the FLASH memo-

ry are protected against read-out piracy (including

a re-write protection). When this protection option

is removed the entire FLASH program memory is

automatically erased.

ISPSEL

VSS

RESET

ISPCLK2

ISPDATA 2

ST7

HE10 CONNECTOR TYPE

TO PROGRAMMING TOOL

APPLICATION

4.7k

Ω

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