ST72411R datasheet(10/71 Pages) STMICROELECTRONICS

10 / 71 page

ST72411R

10/71

1.4 FLASH PROGRAM MEMORY

1.4.1 Introduction

Flash devices have a single voltage non-volatile

FLASH memory that may be programmed in-situ

(or plugged in a programming tool) on a byte-by-

byte basis.

1.4.2 Main features

Remote In-Situ Programming (ISP) mode

Up to 16 bytes programmed in the same cycle

MTP memory (Multiple Time Programmable)

Read-out memory protection against piracy

1.4.3 Structural organisation

The FLASH program memory is organised in a

single 8-bit wide memory block which can be used

for storing both code and data constants.

The FLASH program memory is mapped in the up-

per part of the ST7 addressing space (F000h-

FFFFh) and includes the reset and interrupt user

vector area.

1.4.4 In-Situ Programming (ISP) modes

The FLASH program memory can be programmed

using two Remote ISP modes. These ISP modes

allow the contents of the ST7 program memory to

be updated using a standard ST7 programming

tool after the device is mounted on the application

board. This feature can be implemented with a

minimum number of added components and board

area impact.

Examples of Remote ISP hardware interfaces to

the standard ST7 programming tool are described

below. For more details on ISP programming, refer

to the ST7 Programming Specification.

Remote ISP Overview

The Remote ISP modes are initiated by a specific

sequence on the dedicated ISPSEL pin.

The Remote ISP is performed in three steps:

– Selection of the RAM execution mode

– Download of Remote ISP code in RAM

– Execution of Remote ISP code in RAM to pro-

gram the user program into the FLASH

Remote ISP hardware configuration

Remote ISP mode works using either the internal

oscillator (no external clock is necessary), or an

external square wave clock. The selection of the

oscillator (internal or external) depends on the

ISP_SEL pin during the rising edge of RESET pin

(see “MAIN CLOCK CONTROLLER SYSTEM

(MCC)” on page 21).

Two ISP modes exist:

ISP1: ISP signals mapped on smartcard I/O pins

ISP2: ISP signal mapped on general purpose

I/O pins

ISP1 Mode

In ISP1 mode, it is possible to re-program the mi-

crocontroller using a ISO7816 smartcard connec-

tor as shown in Figure 3.

This mode requires five signals (plus the SC_PWR

signal if necessary) to be connected to the pro-

gramming tool. These signals are:

– RESET: device reset

–VSS: device ground power supply

– ISPCLK1: ISP output serial clock pin

– ISPDATA1: ISP input serial data pin

– ISPSEL: Remote ISP mode selection. This pin

has an internal pulldown and must be left high

impedance if the internal oscillator is selected.

Otherwise an appropriate pull-up is needed

(see Electrical Characteristics).

Note: The RESET and ISPSEL pins are not part of

the ISO7816 interface. Consequently, two addi-

tional contacts on the smartcard connector are

necessary.

Table 3. ISP1 (Smartcard) interface

ISPSEL

VSS

RESET

ISPCLK1

ISPDATA 1

ST72411

SMARTC ARD

FOR ISP

SMARTCARD

CONNEC TOR

SC_PWR

ISO7816

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