Section 21 User Debugging Interface (H-UDI)
Rev. 5.00 May 29, 2006 page 555 of 698
REJ09B0146-0500
21.3
Register Description
The H-UDI has the following registers. Refer to section 23, List of Registers, for more details of
the addresses and access sizes.
•
Bypass register (SDBPR)
•
Instruction register (SDIR)
•
Boundary register (SDBSR)
21.3.1
Bypass Register (SDBPR)
The bypass register is a 1-bit register that cannot be accessed by the CPU. When the SDIR is set to
the bypass mode, the SDBPR is connected between H-UDI pins TDI and TDO.
21.3.2
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
or in the TAP test-logic-reset state, and can be written by the
H-UDI irrespective of the CPU mode. Operation is not guaranteed when a reserved command is
set to this register.
Bit
Bit Name
Initial Value
R/W Description
15
14
13
12
TI3
TI2
TI1
TI0
1
1
1
1
R
R
R
R
Test Instruction Bits
Cannot be written by the CPU.
0000: EXTEST
0100: SAMPLE/PRELOAD
0101: Reserved (Setting prohibited)
0110: H-UDI reset negate
0111: H-UDI reset assert
100X: Reserved (Setting prohibited)
101X: H-UDI interrupt
110X: Reserved (Setting prohibited)
1110: Reserved (Setting prohibited)
1111: Bypass mode (initial value)
0001: Recovery from sleep
11 to 0 —
All 1
R
Reserved
These bits are always read as 1.
Legend: X: Don't care
Summary of Contents for SH7706 Series
Page 8: ...Rev 5 00 May 29 2006 page viii of xlviii ...
Page 160: ...Section 5 Cache Rev 5 00 May 29 2006 page 112 of 698 REJ09B0146 0500 ...
Page 370: ...Section 11 Watchdog Timer WDT Rev 5 00 May 29 2006 page 322 of 698 REJ09B0146 0500 ...
Page 554: ...Section 17 Pin Function Controller PFC Rev 5 00 May 29 2006 page 506 of 698 REJ09B0146 0500 ...
Page 576: ...Section 18 I O Ports Rev 5 00 May 29 2006 page 528 of 698 REJ09B0146 0500 ...
Page 746: ...Index Rev 5 00 May 29 2006 page 698 of 698 REJ09B0146 0500 ...
Page 749: ...SH7706 Group Hardware Manual ...