p8x32a Parallax, Inc., p8x32a Datasheet - Page 4

• Manufacturer Part Number: p8x32a
• Description: 8-cog Multiprocessor Microcontroller
• Manufacturer: Parallax, Inc.

Propeller™ P8X32A Datasheet
2.0
2.1.
2.2.
Copyright © Parallax Inc.
Pin Name
P0 – P31
VDD
VSS
BOEn
RESn
XI
XO
CONNECTION DIAGRAMS
Pin Assignments
Pin Descriptions
I/O
---
Direction
---
I
I/O
I
O
LQFP and QFN Packages
Description
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.
3.3 volt power (2.7 – 3.6 VDC)
Ground
Brown Out Enable (active low). Must be connected to either VDD or VSS. If low, RESn becomes a
weak output (delivering VDD through 5 kΩ) for monitoring purposes but can still be driven low to cause
reset. If high, RESn is CMOS input with Schmitt Trigger.
Reset (active low).
Propeller restarts 50 ms after RESn transitions from low to high.
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.
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.
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.
Table 2: Pin Descriptions
When low, resets the Propeller chip: all cogs disabled and I/O pins floating.
Page 4 of 36
DIP Package
Rev 1.0 11/14/2007
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