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| 型號： | V30MZ |
| 英文描述： | V30MZ(TM) Hardware (Preliminary) | User＇s Manual[01/2002] |
| 中文描述： | V30MZ（TM）硬件（初步）|用戶手冊[01/2002] |
| 文件頁數(shù)： | 58/89頁 |
| 文件大?。?/td> | 418K |
| 代理商： | V30MZ |
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CHAPTER 5 INTERRUPT FUNCTIONS
58
5.1 Hardware Interrupt
There are two kinds of hardware interrupt.
Non-maskable interrupt (NMI)
Maskable interrupt (INT)
5.1.1 Non-maskable interrupt (NMI)
NMI is a non-maskable interrupt and cannot be disabled by software. Whenever there is an input to the NMI pin
from a peripheral device, it is always acknowledged and detected on a rising edge.
NMI takes precedence over INT and is used to cope with abrupt variation of the normal power supply
(instantaneous power failure) and memory error, bus error, etc.
No interrupt acknowledge cycle is issued by NMI and no interrupt acknowledge is output, either.
Caution
NMI requests are acknowledged even immediately after reset (INT requests are not
acknowledged), but until the correct value is loaded to the stack pointer (SS:SP), normal NMI
processing cannot be performed. Therefore, implement measures such as masking the NMI
input with an external circuit.
5.1.2 Maskable interrupt (INT)
Maskable interrupts (INT) are acknowledged with the following response sequence. Prepare the interrupt
acknowledge signal by decoding the BS3 to BS0 signals (when BS3 to BS0 are all low level).
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