SH7619_09 Datasheet, PDF (670/860 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7619 Series

Section 21 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.
21.5.2 Points for Attention
• Boundary scan mode does not cover clock-related system signals (EXTAL, XTAL, CKIO, and
CK_PHY), E10A-related signals (RES and ASEMD), and 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.
21.6 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 Jul. 15, 2009 Page 630 of 816
REJ09B0237-0600