HD6432646 Hitachi, HD6432646 Datasheet - Page 169
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HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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6.3
The operation flow from break condition setting to PC break interrupt exception handling is shown
in sections 6.3.1, PC Break Interrupt Due to Instrunction Fetch, and 6.3.2, PC Break Interrupt Due
to Data Access, taking the example of channel A.
6.3.1
1. Initial settings
2. Satisfaction of break condition
3. Interrupt handling
6.3.2
1. Initial settings
Set the break address in BARA. For a PC break caused by an instruction fetch, set the
Set the break conditions in BCRA.
When the instruction at the set address is fetched, a PC break request is generated
After priority determination by the interrupt controller, PC break interrupt exception
Set the break address in BARA. For a PC break caused by a data access, set the target
Set the break conditions in BCRA.
address of the first instruction byte as the break address.
BCRA bit 6 (CDA): With a PC break caused by an instruction fetch, the bus master must
be the CPU. Set 0 to select the CPU.
BCRA bits 5–3 (BAMA2–0): Set the address bits to be masked.
BCRA bits 2–1 (CSELA1–0): Set 00 to specify an instruction fetch as the break condition.
BCRA bit 0 (BIEA): Set to 1 to enable break interrupts.
immediately before execution of the fetched instruction, and the condition match flag
(CMFA) is set.
handling is started.
ROM, RAM, I/O, or external address space address as the break address. Stack operations
and branch address reads are included in data accesses.
BCRA bit 6 (CDA): Select the bus master.
BCRA bits 5–3 (BAMA2–0): Set the address bits to be masked.
BCRA bits 2–1 (CSELA1–0): Set 01, 10, or 11 to specify data access as the break
condition.
BCRA bit 0 (BIEA): Set to 1 to enable break interrupts.
Operation
PC Break Interrupt Due to Instruction Fetch
PC Break Interrupt Due to Data Access
135
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