Cypress Semiconductor AN6077 Guide de l'utilisateur télécharger pdf (Page 25)

CY3687 MoBL-USB FX2LP18 Development Kit User Guide, Doc. # 001-68582 Rev. *B 25

Development Board

U4 has the group address 0100 and is strapped to unit address 001. Therefore to write a value to the

7-segment readout, 8051 firmware sends a control byte of 01000010 (the LSB indicates a write

operation), followed by the data byte.

U2 uses its I/O pins as inputs connected to S1-S4 according to the following table:

U2 has the group address 0100, and is strapped to unit address 000. Therefore to read the switch

values, 8051 firmware sends a control byte of 01000001 (the LSB indicates a read operation), and

then reads the data byte.

3.8 LED Indicators

LEDs D1, D2, and D4 indicate available power on the three power rails (3.3 V, 2.5 V, and 1.8 V).

LED D3 indicates drive activity on the ATA connector. LED D5 indicates that the debugger is active.

Bit Switch

0 S1

1 S2

2 S3

3 S4

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 106 107

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Cypress Semiconductor AN6077 Guide de l'utilisateur Page 25