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Section 25 User Debug Interface (H-UDI)
The user debug interface (H-UDI) provides a boundary scan function using the JTAG (Joint Test
Action Group, IEEE Std 1149.1, IEEE Standard Test Access Port and Boundary-Scan
Architecture) and a pin-compatible serial interface. The H-UDI performs serial transfer by means
of external signal control.
25.1
Features
The H-UDI has the following features conforming to the IEEE1149.1 standard.
• Five test pins (ETCK, ETDI, ETDO, ETMS, and ETRST)
• TAP controller
• Six instructions
BYPASS mode
EXTEST mode
SAMPLE/PRELOAD mode
CLAMP mode
HIGHZ mode
IDCODE mode
(These instructions are test modes corresponding to IEEE 1149.1.)
HUDS000A_000020020300
Section 25 User Debug Interface (H-UDI)
Rev. 3.00 Jan 25, 2006 page 741 of 872
REJ09B0286-0300
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