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參數資料
| 型號： | DS83C530-ENL |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Microcontroller |
| 英文描述： | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | TQFP-52 |
| 文件頁數： | 18/44頁 |
| 文件大?。?/td> | 754K |
| 代理商： | DS83C530-ENL |
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DS87C530/DS83C530
25 of 44
user can enable the Watchdog Interrupt using EWDI (EIE.4). The Special Function Register map is
shown above.
INTERRUPTS
The DS87C530/DS83C530 provides 14 interrupt sources with three priority levels. The Power-Fail
Interrupt (PFI) has the highest priority. Software can assign high or low priority to other sources. All
interrupts that are new to the 8051 family, except for the PFI, have a lower natural priority than the
originals.
INTERRUPT SOURCES AND PRIORITIES Table 9
NAME
DESCRIPTION
VECTOR
NATURAL
PRIORITY
8051/DALLAS
PFI
Power Fail Interrupt
33h
1
DALLAS
INT0
External Interrupt 0
03h
2
8051
TF0
Timer 0
0Bh
3
8051
INT1
External Interrupt 1
13h
4
8051
TF1
Timer 1
1Bh
5
8051
SCON0
TI0 or RI0 from serial port 0
23h
6
8051
TF2
Timer 2
2Bh
7
8051
SCON1
TI1 or RI1 from serial port 1
3Bh
8
DALLAS
INT2
External Interrupt 2
43h
9
DALLAS
INT3
External Interrupt 3
4Bh
10
DALLAS
INT4
External Interrupt 4
53h
11
DALLAS
INT5
External Interrupt 5
5Bh
12
DALLAS
WDTI
Watchdog Time-Out Interrupt
63h
13
DALLAS
RTCI
Real Time Clock Interrupt
6Bh
14
DALLAS
TIMED ACCESS PROTECTION
It is useful to protect certain SFR bits from an accidental write operation. The Timed Access procedure
stops an errant CPU from accidentally changing these bits. It requires that the following instructions
precede a write of a protected bit.
MOV
0C7h, #0AAh
MOV
0C7h, #55h
Writing an AAh then a 55h to the Timed Access register (location C7h) opens a three-cycle window for
write access. The window allows software to modify a protected bit(s). If these instructions do not
immediately precede the write operation, then the write will not take effect. The protected bits are:
相關PDF資料 |
PDF描述 |
|---|---|
| DS87C530-ECL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQFP52 |
| DS87C520-MCL | 8-BIT, OTPROM, MICROCONTROLLER, PDIP40 |
| DS87C520-QNL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQCC44 |
| DS87C520-QCL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQCC44 |
| DS87C520-ECL | 8-BIT, OTPROM, 33 MHz, MICROCONTROLLER, PQFP44 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS83C530-ENL+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-QCL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Micro with Real Time Clock |
| DS83C530-QCL+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-QNL | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS83C530-QNL+ | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
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