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ST7LITE3XF2 数据表(PDF) 13 Page - STMicroelectronics |
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ST7LITE3XF2 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 173 page  ST7LITE3xF2 13/173 FLASH PROGRAM MEMORY (Cont’d) 4.4 ICC 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: ICC output serial clock pin – ICCDATA: ICC input serial data pin – CLKIN/PB4: main clock input for external source –VDD: application board power supply (option- al, see Note 3) Figure 5. Typical ICC Interface Notes: 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 if 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 con- flicts between the programming tool and the appli- cation 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 appli- cation RESET circuit in this case. When using a classical RC network with R>1K or a reset man- agement IC with open drain output and pull-up re- sistor>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 Program- ming Tools (it is used to monitor the application power supply). Please refer to the Programming Tool manual. 4. Pin 9 must be connected to the PB4 pin of the ST7 when the clock is not available in the applica- tion or if the selected clock option is not pro- grammed in the option byte. ST7 devices with multi-oscillator capability must have OSC2 grounded in this case. 5. With any programming tool, while the ICP option is disabled, the external clock must be provided on PB4. 6. In 38-pulse ICC mode, the internal RC oscillator is forced as a clock source, regardless of the se- lection in the option byte. For ST7LITE30 devices which do not support the internal RC oscillator, the “option byte disabled” mode must be used (35- pulse ICC mode entry, clock provided by the tool). Caution: During normal operation ICCCLK pin must be pulled- up, internally or externally (exter- nal pull-up of 10k mandatory in noisy environ- ment). This avoids entering ICC mode unexpectedly during a reset. In the application, even if the pin is configured as output, any reset puts it back in input pull-up. 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) 1 |
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