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21
21-4
Rev.1.0
JTAG
21.3 JTAG Registers
21.3 JTAG Registers
21.3.1 Instruction Register (JTAGIR)
The Instruction Register (JTAGIR) is a 6-bit register to hold instruction code. This register is set in
IR path sequence. The instructions set in this register determine the data register to be selected in
the subsequent DR path sequence.
When test is reset (to initialize the test circuit), the initial value of this register is b'000010 (IDCODE
instruction). After a test reset, the IDCODE Register is selected as the data register until an
instruction code is set by an external device. In "Capture-IR" state, this register always has
b'110001 (fixed value) loaded into it. Therefore, when in "Shift-IR" state, no matter what value was
set in this register, b'110001 is always output from the JTDO pin (sequentially beginning with LSB).
However, this value normally is not handled as instruction code.
Shown below is outside the scope of guaranteed operations. Note that if this operation is
performed, the device may inadvertently handle b'110001 as instruction code, which makes it
unable to operate normally.
[Capture-IR]
→
[Exit1-IR]
→
[Update-IR]
The 32172/32173's JTAG interface supports the following instructions:
• Three instructions stipulated as essential in IEEE 1149.1 (EXTEST, SAMPLE/PRELOAD,
BYPASS)
• Device ID register access instruction (IDCODE)
Table 21.3.1 JTAG Instruction List
Instruction Code
Abbreviation
Operation
b'000000
EXTEST
Tests circuit/board-level connections outside the chip.
b'000001
SAMPLE/PRELOAD
Samples operating circuit status and outputs the sampled status
from JTDO pin, while at the same time entering the data used for
boundary-scan test from the JTDI pin and presets it in Boundary
Scan Register.
b'000010
IDCODE
Selects ID Code Register and outputs device and manufacturer
identification data from JTDO pin.
b'111111
BYPASS
Selects Bypass Register and inspects or sets data.
Note 1: Do not set any other instruction code.
Note 2: For details about "IR path sequence," "DR path sequence," "Test reset," "Capture-IR" state,
"Shift-IR" state, "Exit1-IR" state, and "Update-IR" state, refer to Section 21.4.
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 ...