HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 723

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

26.3
The H-UDI has the following registers. For details on register addresses and register states in each
processing state, see section 27, List of Registers*.
• Bypass register (SDBPR)
• Instruction register (SDIR)
• Boundary scan register (SDBSR)
• ID register (SDID)
Note: * The H-UDI registers can be accessed from the CPU only when the emulator function is
26.3.1
SDBPR is a 1-bit register that can be accessed only via the H-UDI pin. This register cannot be
accessed from the CPU. When SDIR is set to bypass mode, SDBPR is connected between H-UDI
pins TDI and TDO. The initial value is undefined.
26.3.2
SDIR is a 3-bit register in normal mode. This register can be written only via the H-UDI pin. This
register cannot be accessed from the CPU. Undefined value is read even when this register is
accessed from the CPU using the address which is listed in section 27, List of Registers. JTAG
IDCODE is set in SDIR as the initial value. Operation is not guaranteed if a reserved command is
set in SDIR.
In ASE mode, SDIR is a 16-bit read-only register read from the CPU. The JTAG function is
disabled. For details on the function of SDIR in ASE mode, refer to the emulator’s user’s manual.
Bit
2
1
0
Bit Name
TI2
TI1
TI0
Register Descriptions
Bypass Register (SDBPR)
Instruction Register (SDIR)
enabled in ASE mode. These registers function as part of the dedicated circuit for the
JTAG function in normal mode (mode in which boundary scan function is used).
Therefore, these registers should not be accessed from the CPU in normal mode.
1
0
0
Initial
Value
R/W



Description
Test Instruction 2 to 0
The JTAG instruction is transferred to SDIR by a serial
input from TDI. Cannot be accessed from the CPU for
either read or write.
For the commands, see table 26.2.
Rev. 1.00, 02/04, page 685 of 804