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21
21-6
Rev.1.0
JTAG
21.4 Basic Operation of the JTAG
21.4 Basic Operation of the JTAG
21.4.1 Outline of JTAG Operation
The instruction and data registers basically are accessed in the following three operations, which
are performed based on state transitions of the TAP controller. The TAP controller changes state
according to JTMS input, and generates control signals required for operation in each state.
• Capture operation
The result of boundary-scan test or the fixed data defined for each register is sampled. As
register operation, the input data is loaded into the shift register stage.
• Shift operation
The register is accessed from outside through the boundary-scan path. The sampled value is
output to an external device at the same time data is set from outside. As register operation, bits
are shifted right between each shift register stage.
• Update operation
The data set from outside during shift is driven. As register operation, the value set in the shift
register stage is transferred to the parallel output stage.
The JTAG interface undergoes transitions of internal state depending on JTMS input as it performs
the following two operations. In either case, the operation basically is performed in order of Capture
→
Shift
→
Update.
• IR path sequence
Instruction code is set in the instruction register to select the data register to be operated on in the
subsequent DR path sequence.
• DR path sequence
The selected data register is operated on to inspect or set data.
Summary of Contents for 32172
Page 20: ... This is a blank page 16 ...
Page 21: ...1 1 Overview 1 2 Block Diagram 1 3 Pin Functions 1 4 Pin Layout CHAPTER 1 CHAPTER 1 OVERVIEW ...
Page 44: ...1 1 24 Rev 1 0 This is a blank page Overview 1 4 Pin Layout ...
Page 58: ...2 2 14 Rev 1 0 This is a blank page CPU 2 6 Data Formats ...
Page 122: ...4 4 26 Rev 1 0 This is a blank page EIT 4 13 Precautions on EIT ...
Page 200: ...7 7 6 Rev 1 0 This is a blank page RESET 7 4 Precautions to Be Taken Immediately after Reset ...
Page 298: ...9 9 58 Rev 1 0 This is a blank page DMAC 9 4 Precautions on Using DMAC ...
Page 776: ...19 19 10 Rev 1 0 RAM BACKUP MODE 19 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 782: ...20 20 6 Rev 1 0 OSCILLATION CIRCUIT 20 2 Clock Generator Circuit This is a blank page ...
Page 856: ...23 23 26 Rev 1 0 This is a blank page ELECTRICAL CHARACTERISTICS 23 6 AC Characteristics ...
Page 857: ...24 1 A D Conversion Characteristics CHAPTER 24 CHAPTER 24 STANDARD CHARACTERISTICS ...
Page 859: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 865: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...