28138 Parallax Inc, 28138 Datasheet - Page 9

• Manufacturer Part Number: 28138
• Description: BOARD DEV PROFESSIONAL
• Manufacturer: Parallax Inc
• Series: BASIC Stamp®r
• Type: MCUr

Specifications of 28138

• Contents: Development Board
• Processor To Be Evaluated: SX28AC/DP
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: BASIC Stamp®, Javelin Stamp, and SX28AC/DP
• For Use With: 900-00014 - SERVO CONTROLLER PICO GWS130-28029 - KIT PARTS SMART SENSORS27957 - MANUAL USER FOR JAVELIN STAMP28138 - BOARD DEV PROFESSIONAL805-00006 - CABLE USB A TO MINI B27937 - MEMORY STICK DATALOGGER658-1021-5 - PROGRAMMER TEACLIPPER/STAMP30010 - BASIC STAMP LOGIC ANALYZER27220 - BOOK STAMPWORKS27330 - PROGRAMMER STACHE BASIC STAMP27218 - MANUAL BASIC STAMP VER 2.0
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

DS1307 Real-Time-Clock (X14)
The DS1307 is a real-time-clock that also contains 56 bytes of battery-backed RAM.
Data transfer
2
between the host micro and the DS1307 is with the Philips I
C protocol which is directly supported by the
BS2p-family (with I2CIN and I2COUT), as well as the SX/B compiler (with I2CSTART, I2CSEND, I2CRECV,
and I2CSTOP). For other BASIC Stamp 2 members as well as the Javelin Stamp, I2C routines can be
synthesized using other instructions.
In addition to the SDA (serial data) and SCL (serial clock) connections, the SQW (programmable square
wave output) is provided at X14.
Using a Ceramic Resonator with the SX28AC/DP (Y1)
When programming and debugging an SX28AC/DP project the clock for the SX28AC/DP will be provided
by the SX-Key. For stand-alone testing, remove the SX-Key and install an appropriate 3-pin ceramic
resonator into socket Y1.
Board Dimensions
9” W x 5-1/4” H x ¾” D (23 cm x 13.5 cm x 2 cm)
Copyright © Parallax, Inc.
Professional Development Board (#28138)
v2.0 9/3/2008 Page 9 of 10