Section 30 User Debugging Interface (H-UDI)
Rev.1.00 Dec. 13, 2005 Page 1138 of 1286
REJ09B0158-0100
3. This pin should be connected to ground, the
PRESET
, or another pin which operates in
the same manner as the
PRESET
pin. However, when connected to a ground pin, the
following problem occurs. Since the
TRST
pin is pulled up within this LSI, a weak
current flows when the pin is externally connected to ground pin. The value of the
current is determined by a resistance of the pull-up MOS for the port pin. Although this
current does not affect the operation of this LSI, it consumes unnecessary power.
The TCK clock or the CPG of this LSI should be set to ensure that the frequency of the TCK clock
is less than the peripheral-clock frequency of this LSI.
30.3
Boundary Scan TAP Controllers (IDCODE, EXTEST,
SAMPLE/PRELOAD, and BYPASS)
The H-UDI contains two separate TAP controllers: one for controlling the boundary-scan function
and another for controlling the H-UDI reset and interrupt functions. Assertion of
TRST
, for
example at power-on reset, activates the boundary-scan TAP controller and enables the boundary-
scan function prescribed in the JTAG standards. Executing a switchover command to the H-UDI
allows usage of the H-UDI reset and H-UDI interrupts. This LSI, however, has the following
limitations:
•
Clock-related pins (EXTAL, XTAL, EXTAL2, and XTAL2) are out of the scope of the
boundary-scan test.
•
Reset-related pin (
PRESET
) is out of the scope of the boundary-scan test.
•
H-UDI-related pins (TCK, TDI, TDO, TMS,
TRST
and MPMD) are out of the scope of the
boundary-scan test.
•
DDRIF-related pins are out of the scope of the boundary-scan test.
•
XRTCTBI
pin is out of the scope of the boundary-scan test.
•
During the boundary scan (IDCODE, EXTEST, SAMPLE/PRELOAD, BYPASS, and H-UDI
switchover command), the maximum TCK signal frequency is 2 MHz.
•
The external controller has 8-bit access to the boundary-scan TAP controller via the H-UDI.
Note: During the boundary scan, the MPMD and
PRESET
pins should be fixed high-level.
Table 30.2 shows the commands supported by boundary-scan TAP controller.
Figure 30.2 shows the sequence for switching from boundary-scan TAP controller to H-UDI.
Summary of Contents for SH7780 Series
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Page 82: ...Section 1 Overview Rev 1 00 Dec 13 2005 Page 32 of 1286 REJ09B0158 0100 ...
Page 122: ...Section 3 Instruction Set Rev 1 00 Dec 13 2005 Page 72 of 1286 REJ09B0158 0100 ...
Page 146: ...Section 4 Pipelining Rev 1 00 Dec 13 2005 Page 96 of 1286 REJ09B0158 0100 ...
Page 196: ...Section 6 Floating Point Unit FPU Rev 1 00 Dec 13 2005 Page 146 of 1286 REJ09B0158 0100 ...
Page 292: ...Section 9 L Memory Rev 1 00 Dec 13 2005 Page 242 of 1286 REJ09B0158 0100 ...
Page 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
Page 674: ...Section 15 Clock Pulse Generator CPG Rev 1 00 Dec 13 2005 Page 624 of 1286 REJ09B0158 0100 ...
Page 692: ...Section 16 Watchdog Timer and Reset Rev 1 00 Dec 13 2005 Page 642 of 1286 REJ09B0158 0100 ...
Page 726: ...Section 18 Timer Unit TMU Rev 1 00 Dec 13 2005 Page 676 of 1286 REJ09B0158 0100 ...
Page 1032: ...Section 25 Audio Codec Interface HAC Rev 1 00 Dec 13 2005 Page 982 of 1286 REJ09B0158 0100 ...
Page 1150: ...Section 28 General Purpose I O GPIO Rev 1 00 Dec 13 2005 Page 1100 of 1286 REJ09B0158 0100 ...
Page 1184: ...Section 29 User Break Controller UBC Rev 1 00 Dec 13 2005 Page 1134 of 1286 REJ09B0158 0100 ...
Page 1266: ...Section 31 Electrical Characteristics Rev 1 00 Dec 13 2005 Page 1216 of 1286 REJ09B0158 0100 ...
Page 1328: ...Appendix Rev 1 00 Dec 13 2005 Page 1278 of 1286 REJ09B0158 0100 ...
Page 1336: ...Rev 1 00 Dec 13 2005 Page 1286 of 1286 REJ09B0158 0100 ...
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