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參數(shù)資料
| 型號： | μPD784225Y |
| 廠商： | NEC Corp. |
| 英文描述： | 16 Bit Single Chip Microcontrollers(16 位單片微控制器) |
| 中文描述： | 16位單片機微控制器（16位單片微控制器） |
| 文件頁數(shù)： | 44/68頁 |
| 文件大小： | 278K |
| 代理商： | ΜPD784225Y |
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44
μ
PD784224Y, 784225Y
8. INTERRUPT FUNCTION
As the servicing in response to an interrupt request, the three types shown in Table 8-1 can be selected by
program.
Table 8-1. Servicing of Interrupt Request
Servicing Mode
Entity of Servicing
Servicing
Contents of PC and PSW
Vectored interrupt
Software
Branches and executes servicing routine
(servicing is arbitrary).
Saves to and restores
from stack.
Context switching
Automatically switches register bank,
branches and executes servicing routine
(servicing is arbitrary).
Saves to or restores from
fixed area in register bank
Macro service
Firmware
Executes data transfer between memory
and I/O (servicing is fixed)
Retained
8.1 Interrupt Sources
Table 8-2 shows the interrupt sources available. As shown, interrupts are generated by 25 types of sources,
execution of the BRK instruction, BRKCS instruction, or an operand error.
The priority of interrupt servicing can be set to four levels, so that nesting can be controlled during interrupt
servicing and that which of the two or more interrupts that simultaneously occur should be serviced first. When the
macro service function is used, however, nesting always proceeds.
The default priority is the priority (fixed) of the service that is performed if two or more interrupt requests, having
the same request, simultaneously generate (refer to
Table 8-2
).
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