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ST7FL19F1MCRE bảng dữ liệu(PDF) 11 Page - STMicroelectronics |
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ST7FL19F1MCRE bảng dữ liệu(HTML) 11 Page - STMicroelectronics |
11 / 138 page ST7L15, ST7L19 11/138 FLASH PROGRAM MEMORY (cont’d) 4.4 ICC INTERFACE ICP needs a minimum of four and up to six 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 – OSC1: Main clock input for external source (not required on devices without OSC1/OSC2 pins) –VDD: Application board power supply (option- al, see Note 3) Figure 4. Typical ICC Interface Notes: 1. If the ICCCLK or ICCDATA pins are only used as out- puts 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 must be implemented in case another de- vice 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 man- agement 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 gen- erated 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 con- nected when using most ST Programming Tools (it is used to monitor the application power supply). Please re- fer to the Programming Tool Manual. 4. Pin 9 must be connected to the OSC1 pin of the ST7 when the clock is not available in the application or if the selected clock option is not programmed in the option byte. On ST7 devices with multi-oscillator capability, OSC2 must be grounded in this case. 5. In 38-pulse ICC mode, the internal RC oscillator is forced as a clock source, regardless of the selection in the option byte. For ST7L1 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 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 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 CL2 CL1 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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