647
Table 22.1 shows the H-UDI register configuration.
Table 22.1
H-UDI Registers
CPU Side
H-UDI Side
Initial
Name
Abbreviation
R/W
Size
Address
R/W
Size
Value
*
Bypass register
SDBPR
—
—
—
R/W
1
Undefined
Instruction register
SDIR
R
16
H'04000200
R/W
16
H'FFFF
Boundary register
SDBSR
—
—
—
R/W
—
Undefined
Note:
*
Initialized when
TRST
pin is low or when TAP is in the test-logic-reset state.
22.3.1
Bypass Register (SDBPR)
The bypass register 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.
22.3.2
Instruction Register (SDIR)
The instruction register (SDIR) is a 16-bit read-only register. The register is in bypass mode 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
14
13
12
11
10
9
8
TI3
TI2
TI1
TI0
—
—
—
—
Initial value:
1
1
1
1
1
1
1
1
Bit:
7
6
5
4
3
2
1
0
—
—
—
—
—
—
—
—
Initial value:
1
1
1
1
1
1
1
1
Bits 15 to 12—Test Instruction Bits (TI3 to TI0): Cannot be written by the CPU.
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