CY3684 Cypress Semiconductor Corp, CY3684 Datasheet - Page 20

• 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

The low address byte is “don’t care”. This means you can very efficiently add software test points
using the following code:
This code example uses the 8051 8-bit indirect addressing mode. The MPAGE register (SFR
0x92) supplies the high address byte, and r0 supplies the low address byte. Register r0 does not
require initialization since the low address byte is “don’t care” for the LED decoding.
To turn the LEDS on and off using C code, declare the external memory locations, and then read
their values into dummy variables:
Note: Program execution at these addresses will NOT activate the LEDs.
Page -16
D5ON:
;
D5OFF:
xdata volatile unsigned char D5ON
xdata volatile unsigned char D5OFF
unsigned char dum;
dum = D5ON;
dum = D5OFF;
mov MPAGE,#B8h
movx a,@r0
mov MPAGE,#B0h
movx a,@r0
Indicator
D2
D3
D4
D5
// turn D5 on
// turn D5 off
These 4 jumpers must be in place
D5 D4
Turn ON by reading Turn OFF by reading
0x88--
0x98--
0xA8--
0xB8--
D3 D2
EZ-USB Development Kit Manual - Getting Started Rev 1.0
; turn D5 on
; dummy read
; turn D5 off
; dummy read
_at_ 0xB800;
_at_ 0xB000;
0xA0--
0xB0--
0x80--
0x90--