Spy-Bi-Wire
Jump to navigation
Jump to search
Spy-Bi-Wire is a serialized JTAG protocol developed by Texas Instruments for their MSP430 microcontrollers.
To avoid dedicating four pins as required by the general JTAG interface, the Spy-Bi-Wire protocol only uses two: one for bidirectional data, and one for the clock signal. Time-division multiplexing is used to share the data pin by alternating usage of the pin during each clock pulse in a round-robin fashion: the first clock pulse is a time slot for "Test Mode Select" (TMS), the second clock pulse is a slot for "Test Data In" (TDI), and the third clock pulse is a slot for "Test Data Out" (TDO).[1]
References
<templatestyles src="Reflist/styles.css" />
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".