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參數(shù)資料
| 型號： | μPD784031Y |
| 廠商： | NEC Corp. |
| 英文描述： | 8/16 Bit Single Chip Microcontrollers(8/16 位微控制器) |
| 中文描述： | 8 / 16位單片機微控制器（8 / 16位微控制器） |
| 文件頁數(shù)： | 41/66頁 |
| 文件大?。?/td> | 392K |
| 代理商： | ΜPD784031Y |
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41
μ
PD784031Y
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
Vector interrupt
Software
Branches and executes servicing routine
Saves to and restores
(servicing is arbitrary).
from stack.
Context switching
Automatically switches register bank,
Saves to or restores from
branches and executes servicing routine
fixed area in register bank
(servicing is arbitrary).
Macro service
Firmware
Executes data transfer between memory
Retained
and I/O (servicing is fixed)
8.1 Interrupt Sources
Table 8-2 shows the interrupt sources available. As shown, interrupts are generated by 24 types of sources,
execution of the BRK 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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