SH7713 datasheet(786/904 Pages) RENESAS

786 / 904 page

Section 22 User Debugging Interface (H-UDI)

Rev.1.50 Aug. 30, 2006 Page 746 of 860

REJ09B0288-0150

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 B'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.

22.5.2

Points for Attention

1. Boundary scan mode does not cover clock-related signals (EXTAL, EXTAL2, XTAL,

XTAL2, CKIO, CKIO2).

2. Boundary scan mode does not cover reset-related signals (

RESETP, RESETM).

3. Boundary scan mode does not cover H-UDI-related signals (TCK, TDI, TDO, TMS,

TRST).

4. Boundary scan mode does not cover the

ASEMD0 pin.

5. When the EXTEST, CLAMP, and HIGHZ commands are set, fix the

RESETP pin low.

6. When a boundary scan test for other than BYPASS and IDCODE is carried out, fix the

ASEMD0 pin high.

22.6

Usage Notes

1. 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 chip operations is once set.

2. In standby mode, the H-UDI function cannot be used. To retain the TAP status before and

after standby mode, keep TCK high before entering standby mode.

3. The H-UDI is used for emulator connection. Therefore, H-UDI functions cannot be used when

using an emulator.

22.7

Advanced User Debugger (AUD)

The AUD is a function only for an emulator. For details on the AUD, refer to each emulator’s

user’s manual.

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