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STX-RLINK Datasheet(PDF) 14 Page - STMicroelectronics |
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STX-RLINK Datasheet(HTML) 14 Page - STMicroelectronics |
14 / 124 page ST7LITE0xY0, ST7LITESxY0 14/124 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: main clock input for external source –VDD: application board power supply (option- al, see Note 3) 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 in case another de- vice forces the signal. Refer to the Programming Tool documentation for recommended resistor val- ues. 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 has to be connected to the CLKIN pin of the ST7 when the clock is not available in the ap- plication or if the selected clock option is not pro- grammed in the option byte. 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 is to avoid entering ICC mode unex- pectedly 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 ICC Interface 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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