- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄297644 > UPSD3253B-40T6 (STMICROELECTRONICS) 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP52 PDF資料下載
參數(shù)資料
| 型號(hào)： | UPSD3253B-40T6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | PLASTIC, TQFP-52 |
| 文件頁數(shù)： | 133/189頁 |
| 文件大?。?/td> | 1638K |
| 代理商： | UPSD3253B-40T6 |
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頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁當(dāng)前第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁
Obsolete
Product(s)
- Obsolete
Product(s)
Interrupt system
UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV
5.11
How interrupts are handled
The interrupt flags are sampled at S5P2 of every machine cycle. The samples are polled
during following machine cycle. If one of the flags was in a set condition at S5P2 of the
preceding cycle, the polling cycle will find it and the interrupt system will generate an LCALL
to the appropriate service routine, provided this H/W generated LCALL is not blocked by any
of the following conditions:
●
An interrupt of equal priority or higher priority level is already in progress.
●
The current machine cycle is not the final cycle in the execution of the instruction in
progress.
●
The instruction in progress is RETI or any access to the interrupt priority or interrupt
enable registers.
The polling cycle is repeated with each machine cycle, and the values polled are the values
that were present at S5P2 of the previous machine cycle.
Note:
If an interrupt flag is active but being responded to for one of the above mentioned
conditions, if the flag is still inactive when the blocking condition is removed, the denied
interrupt will not be serviced. In other words, the fact that the interrupt flag was once active
but not serviced is not remembered. Every polling cycle is new.
The processor acknowledges an interrupt request by executing a hardware generated
LCALL to the appropriate service routine. The hardware generated LCALL pushes the
contents of the Program Counter on to the stack (but it does not save the PSW) and reloads
the PC with an address that depends on the source of the interrupt being vectored to as
shown in Table 24.
Execution proceeds from that location until the RETI instruction is encountered. The RETI
instruction informs the processor that the interrupt routine is no longer in progress, then
pops the top two bytes from the stack and reloads the Program Counter. Execution of the
interrupted program continues from where it left off.
Note:
A simple RET instruction would also return execution to the interrupted program, but it would
have left the interrupt control system thinking an interrupt was still in progress, making future
interrupts impossible.
Table 24.
Vector addresses
Source
Vector address
Int0
0003h
2nd USART
004Bh
Timer 0
000Bh
IC
0043h
Int1
0013h
DDC
003Bh
Timer 1
001Bh
USB
0033h
1st USART
0023h
Timer 2+EXF2
002Bh
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPSD3334D-40U6 | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP80 |
| US1001FL | 0.5 A, 100 V, SILICON, SIGNAL DIODE |
| US1A-HE3 | 1 A, 50 V, SILICON, SIGNAL DIODE, DO-214AC |
| US1B-HE3 | 1 A, 100 V, SILICON, SIGNAL DIODE, DO-214AC |
| US1G-HE3 | 1 A, 400 V, SILICON, SIGNAL DIODE, DO-214AC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPSD3253B-40T6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253B-40U1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253B-40U1T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253B-40U6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253B-40U6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。