HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 507
HD6417641
Manufacturer Part Number
HD6417641
Description
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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15.3
The H-UDI has the following registers. Refer the section 24, List of Registers, for the addresses
and access size for these registers.
• Bypass register (SDBPR)
• Instruction register (SDIR)
• Boundary scan register (SDBSR)
• ID register (SDID)
15.3.1
SDBPR is a 1-bit register that cannot be accessed by the CPU. When SDIR is set to the bypass
mode, SDBPR is connected between H-UDI pins TDI and TDO. The initial value is undefined but
is initialized to 0 if the TAP is in Capture-DR state.
15.3.2
SDIR is a 16-bit read-only register. The register is in JTAG IDCODE in its initial state. It is
initialized by TRST assertion or in the TAP test-logic-reset state, and can be written to by the H-
UDI irrespective of the CPU mode. Operation is not guaranteed if a reserved command is set in
this register.
Bit
15 to 13
12
11 to 8
7 to 2
1
0
Register Descriptions
Bypass Register (SDBPR)
Instruction Register (SDIR)
Bit Name
TI7 to TI5
TI4
TI3 to TI0
Initial
Value
All 1
0
All 1
All 1
0
1
R/W
R
R
R
R
R
R
Description
Test Instruction 7 to 0
The H-UDI instruction is transferred to SDIR by a
serial input from TDI.
For commands, see table 15.2.
Reserved
These bits are always read as 1.
Reserved
This bit is always read as 0.
Reserved
This bit is always read as 1.
Section 15 User Debugging Interface (H-UDI)
Rev. 4.00 Sep. 14, 2005 Page 457 of 982
REJ09B0023-0400
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