- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363666 > NSC800D (National Semiconductor Corporation) NSC800TM High-Performance Low-Power CMOS Microprocessor PDF資料下載
參數(shù)資料
| 型號： | NSC800D |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | NSC800TM High-Performance Low-Power CMOS Microprocessor |
| 中文描述： | NSC800TM高性能低功耗CMOS微處理器 |
| 文件頁數(shù)： | 22/76頁 |
| 文件大?。?/td> | 785K |
| 代理商： | NSC800D |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁當前第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁
9.0 Timing and Control
(Continued)
A reset to the CPU will force both IFF
1
and IFF
2
to the reset
state disabling maskable interrupts. They can be enabled by
an EI instruction at any time by the programmer. When an EI
instruction is executed, any pending interrupt requests will
not be accepted until after the instruction following EI has
been executed. This single instruction delay is necessary in
situations where the following instruction is a return instruc-
tion and interrupts must not be allowed until the return has
been completed. The EI instruction sets both IFF
1
and IFF
2
to the enable state. When the CPU accepts an interrupt,
both IFF
1
and IFF
2
are automatically reset, inhibiting further
interrupts until the programmer wishes to issue a new EI
instruction. Note that for all the previous cases, IFF
1
and
IFF
2
are always equal.
The function of IFF
2
is to retain the status of IFF
1
when a
non-maskable interrupt occurs. When a non-maskable inter-
rupt is accepted, IFF
1
is reset to prevent further interrupts
until reenabled by the programmer. Thus, after a non-mask-
able interrupt has been accepted, maskable interrupts are
disabled but the previous state of IFF
1
is saved by IFF
2
TL/C/5171–27
FIGURE 17. Interrupt Mode 2
22
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NSC800E | NSC800TM High-Performance Low-Power CMOS Microprocessor |
| NSC800N | NSC800TM High-Performance Low-Power CMOS Microprocessor |
| NSC800V | NSC800TM High-Performance Low-Power CMOS Microprocessor |
| NSC858 | NSC858 Universal Asynchronous Receiver/Transmitter |
| NSC858D | NSC858 Universal Asynchronous Receiver/Transmitter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NSC800D/883C | 制造商: 功能描述: 制造商:undefined 功能描述: |
| NSC800D/B | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| NSC800D-1I | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor |
| NSC800D-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor |
| NSC800D-3/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor |
發(fā)布緊急采購，3分鐘左右您將得到回復。