SH7641 Datasheet, PDF (291/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

Section 11 User Break Controller (UBC)
Section 11 User Break Controller (UBC)
The user break controller (UBC) provides functions that simplify program debugging. These
functions make it easy to design an effective self-monitoring debugger, enabling the chip to debug
programs without using an in-circuit emulator. Break conditions that can be set in the UBC are
instruction fetch or data read/write access, data size, data contents, address value, and stop timing
in the case of instruction fetch.
11.1 Features
The UBC has the following features:
1. The following break comparison conditions can be set.
Number of break channels: two channels (channels A and B)
User break can be requested as either the independent or sequential condition on channels A
and B (sequential break setting: channel A and then channel B match with break conditions,
but not in the same bus cycle).
• Address
Comparison bits are maskable in 1-bit units.
One of the four address buses (logic address bus (LAB), internal address bus (IAB),
X-memory address bus (XAB), and Y-memory address bus (YAB)) can be selected.
• Data
Only on channel B, 32-bit maskable.
One of the four data buses (L-bus data (LDB), I-bus data (IDB), X-memory data bus (XDB)
and Y-memory data bus (YDB)) can be selected.
• Bus cycle
Instruction fetch or data access
• Read/write
• Operand size
Byte, word, and longword
2. A user-designed user-break condition exception processing routine can be run.
3. In an instruction fetch cycle, it can be selected that a break is set before or after an instruction
is executed.
4. Maximum repeat times for the break condition (only for channel B): 2¹² − 1 times.
5. Eight pairs of branch source/destination buffers.
Rev. 4.00 Sep. 14, 2005 Page 241 of 982
REJ09B0023-0400