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ST7LITEUS5 数据表(PDF) 19 Page - STMicroelectronics |
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ST7LITEUS5 数据表(HTML) 19 Page - STMicroelectronics |
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19 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) ST7LITEUS2, ST7LITEUS5 Flash program memory 19/136 the I2C protocol routine. This routine enables the ST7 to receive bytes from the I2C interface. ● Download ICP driver code in RAM from the ICCDATA pin ● Execute ICP driver code in RAM to program the FLASH memory Depending on the ICP driver code downloaded in RAM, FLASH memory programming can be fully customized (number of bytes to program, program locations, or selection of the serial communication interface for downloading). 4.3.2 In application programming (IAP) This mode uses an IAP driver program previously programmed in Sector 0 by the user (in ICP mode). This mode is fully controlled by user software. This allows it to be adapted to the user application, (user-defined strategy for entering programming mode, choice of communications protocol used to fetch the data to be stored etc). IAP mode can be used to program any memory areas except Sector 0, which is write/erase protected to allow recovery in case errors occur during the programming operation. 4.4 I2C interface ICP needs a minimum of 4 and up to 6 pins to be connected to the programming tool. These pins are: ● RESET: device reset ● VSS: device power supply ground ● ICCCLK: I2C output serial clock pin ● ICCDATA: I2C input serial data pin ● CLKIN: main clock input for external source ● VDD: application board power supply Refer to Figure 6 for a description of the I2C interface. If the ICCCLK or ICCDATA 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 I2C session is not in progress, the ICCCLK and ICCDATA pins are not available for the application. If they are used as inputs by the application, 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. During the ICP 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 R>1 k Ω or a reset management IC with open drain output and pull-up resistor>1 kΩ, no additional components are needed. In all cases the user must ensure that no external reset is generated by the application during the I2C session. The use of Pin 7 of the I2C connector depends on the programming tool architecture. This pin must be connected when using most ST programming tools (it is used to monitor the application power supply). Please refer to the programming tool manual. Obsolete Product(s) - Obsolete Product(s) |
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