Datasheet

Propeller™ P8X32A Datasheet www.parallax.com

2.0 CONNECTION DIAGRAMS

2.1. Pin Assignments

LQFP and QFN Packages

DIP Package

2.2. Pin Descriptions

Table 2: Pin Descriptions

Pin Name Direction Description

P0 – P31 I/O

General purpose I/O Port A. Can source/sink 40 mA each at 3.3 VDC. CMOS level logic with threshold

of  ½ VDD or 1.6 VDC @ 3.3 VDC.

The pins shown below have a special purpose upon power-up/reset but are general purpose I/O

afterwards.

P28 - I2C SCL connection to optional, external EEPROM.

P29 - I2C SDA connection to optional, external EEPROM.

P30 - Serial Tx to host.

P31 - Serial Rx from host.

VDD --- 3.3 volt power (2.7 – 3.6 VDC)

VSS --- Ground

BOEn I

Brown Out Enable (active low). Must be connected to either VDD or VSS. If low, RESn becomes a

weak output (delivering VDD through 5 k) for monitoring purposes but can still be driven low to cause

reset. If high, RESn is CMOS input with Schmitt Trigger.

RESn I/O

Reset (active low). When low, resets the Propeller chip: all cogs disabled and I/O pins floating.

Propeller restarts 50 ms after RESn transitions from low to high.

XI I

Crystal Input. Can be connected to output of crystal/oscillator pack (with XO left disconnected), or to

one leg of crystal (with XO connected to other leg of crystal or resonator) depending on CLK Register

settings. No external resistors or capacitors are required.

XO O

Crystal Output. Provides feedback for an external crystal, or may be left disconnected depending on

CLK Register settings. No external resistors or capacitors are required.