Cypress MB95F223K Cómo hacerlo - Página 4

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Hardware Design

This chapter introduces the circuit of debugging interface.

As the MB95200 series has two types of flash, i.e. single flash and dual flash, there are two types of debugging

circuits corresponding to them. This chapter will introduce the two programming circuits. Make sure to choose the

correct circuit in application.

4.1

Figure 3

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

interface, four pins, UVCC_EV, GND, RSTIN 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 circuit interface.

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 debugger provides 10 V directly to the RSTX pin during flash erase/write operation. If it is pulled high in

the user system, please consider to add a low-drop diode for separate H voltage.

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 needs a reset circuit, please design the reset circuit according to the diagram below.

www.cypress.com

Figure 3. Basic Connector Circuit for Single Flash MCU

Document No. 002-05390 Rev.*A

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