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ST7LITEUS2 数据表(PDF) 20 Page - STMicroelectronics |
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ST7LITEUS2 数据表(HTML) 20 Page - STMicroelectronics |
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20 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Flash program memory ST7LITEUS2, ST7LITEUS5 20/136 Pin 9 has to be connected to the CLKIN pin of the ST7 when I2C mode is selected with option bytes disabled (35-pulse I2C entry mode). When option bytes are enabled (38-pulse I2C 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. A serial resistor must be connected to I2C 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 2 mA at 5 V. 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, ICCCLK pin must be pulled- up, internally or externally (external pull-up of 10 k Ω mandatory in noisy environment). This is to avoid entering I2C 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. Figure 6. Typical I2C interface 4.5 Memory protection There are two different types of memory protection: readout protection and Write/Erase Protection which can be applied individually. 4.5.1 Readout protection Readout protection, when selected provides a protection against program memory content extraction and against write access to Flash memory. Even if no protection can be considered as totally unbreakable, the feature provides a very high level of protection for a general purpose microcontroller. Program memory is protected. I2C CONNECTOR HE10 CONNECTOR TYPE APPLICATION POWER SUPPLY 1 2 4 6 8 10 97 5 3 PROGRAMMING TOOL I2C CONNECTOR APPLICATION BOARD I2C 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) Obsolete Product(s) - Obsolete Product(s) |
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