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ST7LUS5 数据表(PDF) 20 Page - STMicroelectronics |
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ST7LUS5 数据表(HTML) 20 Page - STMicroelectronics |
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20 / 124 page  Flash program memory ST7LUS5, ST7LU05, ST7LU09 20/124 Figure 5. Typical ICC interface 1. 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 ICC 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. 2. 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 5mA at high level (push pull output or pull-up resistor<1K). A schottky diode can be used to isolate the application RESET circuit in this case. When using a classical RC network with R>1K or a reset management IC with open drain output and pull-up resistor>1K, no additional components are needed. In all cases the user must ensure that no external reset is generated by the application during the ICC session. 3. The use of Pin 7 of the ICC 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. 4. Pin 9 has to be connected to the CLKIN pin of the ST7 when ICC mode is selected with option bytes disabled (35-pulse ICC entry mode). When option bytes are enabled (38-pulse ICC entry mode), the internal RC clock (internal RC or AWU RC) is forced. If internal RC is selected in the option byte, the internal RC is provided. If AWU RC or external clock is selected, the AWU RC oscillator is provided. 5. A serial resistor must be connected to ICC connector pin 6 in order to prevent contention on PA3/RESET pin. Contention may occur if a tool forces a state on RESET pin while PA3 pin forces the opposite state in output mode. The resistor value is defined to limit the current below 2mA at 5V. If PA3 is used as output push-pull, then the application must be switched off to allow the tool to take control of the RESET pin (PA3). To allow the programming tool to drive the RESET pin below VIL, special care must also be taken when a pull-up is placed on PA3 for application reasons. Caution: During normal operation, the ICCCLK pin must be pulled up, internally or externally (external pull-up of 10k mandatory in noisy environment). This is to avoid entering ICC mode unexpectedly during a reset. In the application, even if the pin is configured as output, any reset will put it back in input pull-up. 4.5 Memory protection There are two different types of memory protection: readout protection and write/erase protection, either of which can be applied individually. ICC CONNECTOR HE10 CONNECTOR TYPE APPLICATION POWER SUPPLY 1 2 4 6 8 10 97 5 3 PROGRAMMING TOOL ICC CONNECTOR APPLICATION BOARD ICC Cable (See Note 3) ST7 OPTIONAL See Note 1 See Note 1 and Caution See Note 2 APPLICATION RESET SOURCE APPLICATION I/O (See Note 4) 3.3k Ω (See Note 5) |
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