SH7618 Datasheet, PDF (540/646 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series

Section 19 User Debugging Interface (H-UDI)
Data loaded into the output pin boundary scan register in the Capture-DR state is not used for
external circuit testing (it is replaced by a shift operation).
The upper four bits of the instruction code are 0000.
IDCODE: A command can be set in SDIR by the H-UDI pins to place the H-UDI pins in the
IDCODE mode stipulated by JTAG. When the H-UDI is initialized (TRST is asserted or TAP is in
the Test-Logic-Reset state), the IDCODE mode is entered.
CLAMP, HIGHZ: A command can be set in SDIR by the H-UDI pins to place the H-UDI pins in
the CLAMP or HIGHZ mode stipulated by JTAG.
19.5.2 Points for Attention
• Boundary scan mode does not cover clock-related signals (EXTAL, XTAL, CKIO, and
CK_PHY).
• Boundary scan mode does not cover system- and E10A-related signals (RES and ASEMD).
• Boundary scan mode does not cover H-UDI-related signals (TCK, TDI, TDO, TMS, and
TRST).
• When the EXTEST, CLAMP, and HIGHZ commands are set, fix the RES pin low.
• When a boundary scan test for other than BYPASS and IDCODE is carried out, fix the
ASEMD pin high.
19.6 Usage Notes
• An H-UDI command, once set, will not be modified as long as another command is not re-
issued from the H-UDI. If the same command is given continuously, the command must be set
after a command (BYPASS, etc.) that does not affect LSI operations is once set.
• Because LSI operations are suspended in standby mode, H-UDI commands are not accepted.
To hold the state of the TAP before and after standby mode, the TCK signal must be high
during standby mode transition.
• The H-UDI is used for emulator connection. Therefore, H-UDI functions cannot be used when
using an emulator.
Rev. 6.00 Jun. 12, 2007 Page 508 of 610
REJ09B0131-0600