CY3684 Cypress Semiconductor Corp, CY3684 Datasheet - Page 18

• Manufacturer Part Number: CY3684
• Description: KIT DEVELOPMENT EZ-USB FX2LP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB FXr
• Type: MCUr

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

–
–
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,