CY3684 Cypress Semiconductor Corp, CY3684 Datasheet - Page 18
![KIT DEVELOPMENT EZ-USB FX2LP](/photos/9/22/92290/cy3684_board1_sml.jpg)
CY3684
Manufacturer Part Number
CY3684
Description
KIT DEVELOPMENT EZ-USB FX2LP
Manufacturer
Cypress Semiconductor Corp
Series
EZ-USB FXr
Type
MCUr
Datasheet
1.CY3684.pdf
(28 pages)
Specifications of CY3684
Contents
2 Boards, Cables, CD
Silicon Manufacturer
Cypress
Application Sub Type
USB
Kit Application Type
Interface
Silicon Core Number
CY7C68013A-128AXC
Features
FX2LP Development Kit
Silicon Family Name
EZ-USB FX2LP
Rohs Compliant
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
CY7C68013A-128AC, CY7C64713-128AC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
428-1677
CY3684
Q2204408
CY3684
Q2204408
–
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4.9 I
U8 and U10 are Philips PCF8574 I/O expanders. They connect to the I
and provide 8 general-purpose input-output pins. U8 provides 8 output bits, connected to the
seven-segment readout U9. U10 provides 8 input bits, four of which connect to push buttons S2-
S5, and four of which are uncommitted.
U8 connects to the 7-segment readout (U9) using the following bit assignments:
U8 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.
U10 uses its I/O pins as inputs, connected to S2-S5 according to the following table:
Page -14
8051 bus. This is the only configuration that starts 8051 execution from external memory (the
GAL sets EA=1). Since external memory occupies the bottom 16K, the internal EZ-USB RAM
is addressed only as data memory, instead of combined prog/data memory in the other three
configurations.
for testing final code to insure that it uses no external resources present in the development
environment.
The third column, “Ext Flash”, allows a flash memory (or other ROM) to be connected to the
The fourth column, “Single Chip”, disables all external memory. This configuration is useful
2
C Expanders
bit 0
bit 6
bit 3
EZ-USB Development Kit Manual - Getting Started Rev 1.0
bit 7
2
C bus SCL and SDA pins,