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Title: Spy-Bi-Wire  
Author: World Heritage Encyclopedia
Language: English
Subject: Texas Instruments, Debugger, Embedded systems
Collection: Embedded Systems, Hardware Testing, Ieee Standards, Microcontrollers, Texas Instruments
Publisher: World Heritage Encyclopedia


Spy-Bi-Wire is a serialised JTAG protocol developed by Texas Instruments for their MSP430 micro controllers.

In this protocol only two connections are used instead of the usual four pins for the general JTAG interface. The two connections are a bidirectional data output, and a clock. The clocking signal is split into a period of three clock pulses, for each clock pulse the TDI, TDO and TMS signals are passed on the micro controller via the bidirectional data output. [1]


  1. ^ "MSP430™ Programming Via the JTAG Interface". Texas Instruments. 2010. 

External links

  • "MCU debug on a pin-count budget"
  • MSP430™ Programming Via the JTAG Interface
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