參數(shù)資料
型號(hào)： UPD784035YGK
廠商： NEC Corp.
英文描述： 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 16-/8-bit的單晶片微控制器
文件頁(yè)數(shù)： 46/94頁(yè)
文件大?。?/td> 503K
代理商： UPD784035YGK
μ
PD784035Y, 784036Y, 784037Y, 784038Y
46
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
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 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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