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CSTCC10.0MGA Datasheet(PDF) 17 Page - STMicroelectronics |
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CSTCC10.0MGA Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 153 page  ST72334J/N, ST72314J/N, ST72124J 17/153 5 FLASH PROGRAM MEMORY 5.1 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. 5.2 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 5.3 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 and includes the reset and interrupt user vector area . 5.4 IN-SITU PROGRAMMING (ISP) MODE The FLASH program memory can be programmed using Remote ISP mode. This ISP mode allows the contents of the ST7 program memory to be up- dated using a standard ST7 programming tools af- ter the device is mounted on the application board. This feature can be implemented with a minimum number of added components and board area im- pact. An example Remote ISP hardware interface to the standard ST7 programming tool is described be- low. For more details on ISP programming, refer to the ST7 Programming Specification. Remote ISP Overview The Remote ISP mode is initiated by a specific se- quence 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 In Remote ISP mode, the ST7 has to be supplied with power (VDD and VSS) and a clock signal (os- cillator and application crystal circuit for example). This mode needs five signals (plus the VDD signal if necessary) to be connected to the programming tool. This signals are: – RESET: device reset –VSS: device ground power supply – ISPCLK: ISP output serial clock pin – ISPDATA: ISP input serial data pin – ISPSEL: Remote ISP mode selection. This pin must be connected to VSS on the application board through a pull-down resistor. 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 6 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 6. Typical Remote ISP Interface 5.5 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 first automatically erased. However, the E2PROM data memory (when available) can be protected only with ROM devices. ISPSEL VSS RESET ISPCLK ISPDATA ST7 HE10 CONNECTOR TYPE TO PROGRAMMING TOOL 10K Ω CL0 CL1 APPLICATION 47K Ω 1 XTAL |
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