HD6412350 Hitachi, HD6412350 Datasheet - Page 82
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HD6412350
Manufacturer Part Number
HD6412350
Description
(HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6412350.pdf
(989 pages)
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(2) Reset Exception Handling
After the RES pin has gone low and the reset state has been entered, when RES goes high again,
reset exception handling starts. The CPU enters the power-on reset state when the NMI pin is high,
or the manual reset state when the NMI pin is low. When reset exception handling starts the CPU
fetches a start address (vector) from the exception vector table and starts program execution from
that address. All interrupts, including NMI, are disabled during reset exception handling and after
it ends.
(3) Traces
Traces are enabled only in interrupt control mode 2. Trace mode is entered when the T bit of EXR
is set to 1. When trace mode is established, trace exception handling starts at the end of each
instruction.
At the end of a trace exception-handling sequence, the T bit of EXR is cleared to 0 and trace mode
is cleared. Interrupt masks are not affected.
The T bit saved on the stack retains its value of 1, and when the RTE instruction is executed to
return from the trace exception-handling routine, trace mode is entered again. Trace exception-
handling is not executed at the end of the RTE instruction.
Trace mode is not entered in interrupt control mode 0, regardless of the state of the T bit.
(4) Interrupt Exception Handling and Trap Instruction Exception Handling
When interrupt or trap-instruction exception handling begins, the CPU references the stack pointer
(ER7) and pushes the program counter and other control registers onto the stack. Next, the CPU
alters the settings of the interrupt mask bits in the control registers. Then the CPU fetches a start
address (vector) from the exception vector table and program execution starts from that start
address.
Figure 2-16 shows the stack after exception handling ends.
62
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