19
19-4
Ver.0.10
JTAG
19.3 JTAG Registers
19.3 JTAG Registers
19.3.1 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 32170'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 19.3.1 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 19.4.
Summary of Contents for M32170F3VFP
Page 42: ...1 1 24 Ver 0 10 OVERVIEW 1 4 Pin Layout This is a blank page ...
Page 56: ...2 2 14 Ver 0 10 This is a blank page ...
Page 88: ...3 3 32 Ver 0 10 ADDRESS SPACE 3 7 Notes on Address Space This is a blank page ...
Page 270: ...9 9 40 Ver 0 10 DMAC 9 4 Precautions about the DMAC This is a blank page ...
Page 614: ...12 12 64 Ver 0 10 This is a blank page SERIAL I O 12 9 Precautions on Using UART Mode ...
Page 756: ...17 17 10 Ver 0 10 RAM BACKUP MODE 17 4 Exiting RAM Backup Mode Wakeup This is a blank page ...
Page 762: ...18 18 6 Ver 0 10 OSCILLATION CIRCUIT 18 2 Clock Generator Circuit This is a blank page ...
Page 831: ...CHAPTER 22 CHAPTER 22 TYPICAL CHARACTERISTICS 22 1 A D Conversion Characteristics ...
Page 833: ...Appendix 1 1 Dimensional Outline Drawing APPENDIX 1 APPENDIX 1 MECHANICAL SPECIFICATIONS ...
Page 841: ...Appendix 3 1 Precautions about Noise APPENDIX 3 APPENDIX 3 PRECAUTIONS ABOUT NOISE ...