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ST72411R Datasheet(PDF) 10 Page - STMicroelectronics |
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ST72411R Datasheet(HTML) 10 Page - 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 s Remote In-Situ Programming (ISP) mode s Up to 16 bytes programmed in the same cycle s MTP memory (Multiple Time Programmable) s 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: s ISP1: ISP signals mapped on smartcard I/O pins s 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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