參數(shù)資料
型號(hào)： UPD784054GCA1
廠商： NEC Corp.
英文描述： 16-BIT SINGLE-CHIP MICROCONTROLLER
中文描述： 16位單片機(jī)
文件頁(yè)數(shù)： 37/86頁(yè)
文件大小： 579K
代理商： UPD784054GCA1
μ
PD784054(A)
37
8. INTERRUPT FUNCTION
The three types of interrupt processing shown in Table 8-1 can be selected.
Table 8-1. Interrupt Request Processing
Processing Mode
Processed by:
Processing
Contents of PC and PSW
Vectored interrupt
Software
Branches to and executes processing routine
(any processing contents).
Saves and restores to/from
stack.
Context switching
Automatically selects register bank, and branches
to and executes processing routine (any
processing contents).
Saves or restores to/from
fixed area in register bank.
Macro service
Firmware
Executes data transfer between memory and I/O
(any processing contents).
Retained
8.1 Interrupt Source
As interrupt sources, twenty-three sources listed in Table 8-2, BRK instruction execution, and operand error
are available.
Four priority levels of interrupt processing can be selected, so that nesting during interrupt processing and
the levels of interrupt requests that are generated at the same time can be controlled. However, nesting always
advances with macro service (i.e., nesting is not kept pending).
The default priority is the priority (fixed) of the processing for the interrupt requests that have occurred at
the same time and have the same priority level (refer to
Table 8-2
).
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