Cypress MB95F282H Jak to zrobić - Strona 5

Przeglądaj online lub pobierz pdf Jak to zrobić dla Płyta główna Cypress MB95F282H. Cypress MB95F282H 14 stron. How to make on-board debug

Pin 4 of the connector is used to connect to the reset circuit. Please design a switch K1 between the reset circuit and

the reset pin (RSTX). Make sure to cut off K1 to stop the high voltage flowing through the reset circuit during the

debugging operation. Turn on K1 to supply the reset circuit to the target MCU when the debugging operation is over.

4.2

Dual Flash MCU Debugging Circuit

Figure 5

shows the circuit diagram of the in-system debugging interface. To design the in-system debugging

interface, three pins, UVCC_EV, GND and DBG, are needed. (Add pin RST_OUT if necessary.)

Component Recommendation:

D1: VF < 0.3V when IF = 1mA. E.g. LL103A, 1SS294

Below is a list of functions of the interface connector.

J1 is a 10-pin connector, used as the interface of this circuit.

The write voltage (VCC = 4.5V to 5.5V) is supplied from the user system. The UVCC_EV and DBG pins control

the PGM mode entry.

Pin 2 of the connector connects to the GND.

The DBG pin provides 1-line UART communication with the debugger. Serial write mode can be set by providing

special timing of DBG and VCC pins.

If the MCU target need a reset circuit, and please design a reset circuit as follow circuit.

www.cypress.com

Figure 4. Debugging Connector and Reset Circuit for Single Flash MCU

Figure 5. Dual Flash MCU Debugging Circuit

Document No. 002-05390 Rev.*A

F²MC - 8FX Family, MB95200 Series, How to make on-Board Debug