- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄98070 > S3P821AXX-QW 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP80 PDF資料下載
參數(shù)資料
| 型號(hào)： | S3P821AXX-QW |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 14 X 20 MM, QFP-80 |
| 文件頁(yè)數(shù)： | 5/208頁(yè) |
| 文件大?。?/td> | 1310K |
| 代理商： | S3P821AXX-QW |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)當(dāng)前第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)第172頁(yè)第173頁(yè)第174頁(yè)第175頁(yè)第176頁(yè)第177頁(yè)第178頁(yè)第179頁(yè)第180頁(yè)第181頁(yè)第182頁(yè)第183頁(yè)第184頁(yè)第185頁(yè)第186頁(yè)第187頁(yè)第188頁(yè)第189頁(yè)第190頁(yè)第191頁(yè)第192頁(yè)第193頁(yè)第194頁(yè)第195頁(yè)第196頁(yè)第197頁(yè)第198頁(yè)第199頁(yè)第200頁(yè)第201頁(yè)第202頁(yè)第203頁(yè)第204頁(yè)第205頁(yè)第206頁(yè)第207頁(yè)第208頁(yè)
INTERRUPT STRUCTURE
S3C821A/P821A
5-18
FAST INTERRUPT PROCESSING (Continued)
Two other system registers support fast interrupt processing:
— The instruction pointer (IP) contains the starting address of the service routine (and is later used to swap the
program counter values), and
— When a fast interrupt occurs, the contents of the FLAGS register is stored in an unmapped, dedicated
register called FLAGS' (“FLAGS prime”).
NOTE
For the S3C821A microcontroller, the service routine for any one of the seven interrupt levels: IRQ0–
IRQ2, or IRQ4–IRQ7, can be selected for fast interrupt processing.
Procedure for Initiating Fast Interrupts
To initiate fast interrupt processing, follow these steps:
1.
Load the start address of the service routine into the instruction pointer (IP).
2.
Load the interrupt level number (IRQn) into the fast interrupt selection field (SYM.4–SYM.2)
3.
Write a "1" to the fast interrupt enable bit in the SYM register.
Fast Interrupt Service Routine
When an interrupt occurs in the level selected for fast interrupt processing, the following events occur:
1.
The contents of the instruction pointer and the PC are swapped.
2.
The FLAG register values are written to the FLAGS' (“FLAGS prime”) register.
3.
The fast interrupt status bit in the FLAGS register is set.
4.
The interrupt is serviced.
5.
Assuming that the fast interrupt status bit is set, when the fast interrupt service routine ends, the instruction
pointer and PC values are swapped back.
6.
The content of FLAGS' (“FLAGS prime”) is copied automatically back to the FLAGS register.
7.
The fast interrupt status bit in FLAGS is cleared automatically.
Relationship to Interrupt Pending Bit Types
As described previously, there are two types of interrupt pending bits: One type that is automatically cleared by
hardware after the interrupt service routine is acknowledged and executed; the other that must be cleared by the
application program's interrupt service routine. You can select fast interrupt processing for interrupts with either
type of pending condition clear function — by hardware or by software.
Programming Guidelines
Remember that the only way to enable/disable a fast interrupt is to set/clear the fast interrupt enable bit in the
SYM register, SYM.1. Executing an EI or DI instruction globally enables or disables all interrupt processing,
including fast interrupts. If you use fast interrupts, remember to load the IP with a new start address when the fast
interrupt service routine ends.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S3C821AXX-QW | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80 |
| S3P8245XX-TW | 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PQFP80 |
| S3P8454-QW | 8-BIT, OTPROM, 25 MHz, MICROCONTROLLER, PQFP80 |
| S3P8454-TW | 8-BIT, OTPROM, 25 MHz, MICROCONTROLLER, PQFP80 |
| S3P8615-QZ | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S3P8245 | 制造商:SAMSUNG 制造商全稱(chēng):Samsung semiconductor 功能描述:S3C8-SERIES MICROCONTROLLERS |
| S3P8245XZZ-QW85 | 制造商:Samsung Semiconductor 功能描述: |
| S3P8245XZZ-TW85 | 制造商:Samsung Semiconductor 功能描述: |
| S3P8249 | 制造商:SAMSUNG 制造商全稱(chēng):Samsung semiconductor 功能描述:S3C8-SERIES MICROCONTROLLERS |
| S3P8249XZZ-QWR9 | 制造商:Samsung Semiconductor 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。