Rev. 5.00, 09/03, page 643 of 760
Table 22.1 shows the UDI register configuration.
Table 22.1
UDI Registers
CPU Side
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 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 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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