Contiguous A And B Settings For Sequential Conditions - Hitachi SH7751 Hardware Manual

4. When operand access (address only) is set as a break condition, the address of the instruction
to be executed after the instruction at which the condition match occurred is saved to SPC.
5. When operand access (address + data) is set as a break condition, execution of the instruction
at which the condition match occurred is completed. A user break interrupt is generated before
execution of instructions from one instruction later to four instructions later. It is not possible
to specify at which instruction, from one later to four later, the interrupt will be generated. The
start address of the instruction after the instruction for which execution is completed at the
point at which user break interrupt handling is started is saved to SPC. If an instruction
between one instruction later and four instructions later causes another exception, control is
performed as follows. Designating the exception caused by the break as exception 1, and the
exception caused by an instruction between one instruction later and four instructions later as
exception 2, memory updating and register updating that essentially cannot be performed by
exception 2 cannot be performed is guaranteed irrespective of the existence of exception 1.
The program counter value saved is the address of the first instruction for which execution is
suppressed. Whether exception 1 or exception 2 is used for the exception jump destination and
the value written to the exception register (EXPEVT/INTEVT) is not guaranteed. However, if
exception 2 is from a source not synchronized with an instruction (external interrupt or
peripheral module interrupt), exception 1 is used for the exception jump destination and the
value written to the exception register (EXPEVT/INTEVT).
20.3.8

Contiguous A and B Settings for Sequential Conditions

When channel A match and channel B match timings are close together, a sequential break may
not be guaranteed. Rules relating to the guaranteed range are given below.
1. Instruction access matches on both channel A and channel B
Instruction B is 0 instructions after
instruction A
Instruction B is 1 instruction after
instruction A
Instruction B is 2 or more instructions
after instruction A
2. Instruction access match on channel A, operand access match on channel B
Instruction B is 0 or 1 instruction after
instruction A
Instruction B is 2 or more instructions
after instruction A
Equivalent to setting the same address. Do not use
this setting
Sequential operation is not guaranteed
Sequential operation is guaranteed
Sequential operation is not guaranteed
Sequential operation is guaranteed
Rev. 3.0, 04/02, page 769 of 1064