Cypress Semiconductor enCoRe CY7C63310 User's Guide download pdf (Page 7)

CY3655 Hardware User Guide

Pushbuttons and LEDs

Three pushbuttons and three LEDs are available on the board for general purpose use. The

following table shows the enCoRe II signal name relation to the pushbutton or LED and its

jumper.

Pushbutton or LED Jumper enCoRe II Signal Name

D1 LED J12 P0.5

D2 LED J17 P0.6

D3 LED J19 P1.3

S1 Pushbutton J11 P0.2

S2 Pushbutton J16 P0.3

S3 Pushbutton J18 P0.4

The jumpers can be used to isolate the LED or pushbutton from the enCoRe II if desired. Note

that the LEDs use the same power as the enCoRe II. Driving the enCoRe pin low illuminates

the LEDs, and pushbutton presses can be detected by making the appropriate enCoRe II pin

an input with the pull-up enabled and detecting a low level when the button is pressed. Also

note that the pushbutton inputs are connected to enCoRe II pins that can be configured as

external interrupt pins.

Suggestions for Connecting the Pod

The Applications board can be used in conjunction with PSoC Designer and a pod for

development using the ICE-Cube in-circuit emulator. To do this, place either the PDIP-40 or

PDIP-24 foot into the socket at U1 and attach the pod. Note that the PDIP-18 and PDIP-16

feet cannot be used on the Applications board as their pin-outs differ substantially from the

PDIP-24 foot.

External Crystal or Ceramic Resonator Use

An external crystal or ceramic resonator can be used with the PDIP-40 part if a custom

frequency or tighter tolerance frequency is needed. The footprint at Y1 on the board can be

loaded with an HC49 sized through-hole or surface-mount crystal. Optionally a two- or

three-pin ceramic resonator can be used in this position. When using a crystal or ceramic

resonator, the resistors R2 and R3 should be removed to isolate the clock signals from the rest

of the board. Positions C4 and C5 should be populated with the appropriate load capacitance

for enCoRe II and the chosen crystal or ceramic resonator. Note that three-pin ceramic

resonators with built-in load capacitors do not need external capacitors loaded. Refer to the

enCoRe II data sheet for details on crystal or ceramic resonator specifications. Note that the

24-pin enCoRe II device does not support external crystals or ceramic resonators.

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Cypress Semiconductor enCoRe CY7C63310 User's Guide Page 7