參數(shù)資料
型號(hào): ATWEBDVK-02WC
廠商: Atmel
文件頁數(shù): 109/137頁
文件大小: 0K
描述: KIT DEV TCP/IP AT89C51RD2 WEBCAM
標(biāo)準(zhǔn)包裝: 1
系列: @Web
主要目的: *
嵌入式: *
已用 IC / 零件: AT89C51RD2
主要屬性: *
次要屬性: *
已供物品: 板,帶網(wǎng)絡(luò) Webcam 模塊和軟件
產(chǎn)品目錄頁面: 617 (CN2011-ZH PDF)
73
4235K–8051–05/08
AT89C51RD2/ED2
17.1
Registers
The PCA interrupt vector is located at address 0033H, the SPI interrupt vector is located at
address 004BH and Keyboard interrupt vector is located at address 003BH. All other vectors
addresses are the same as standard C52 devices.
Table 17-1.
Priority Level Bit Values
A low-priority interrupt can be interrupted by a high priority interrupt, but not by another low-prior-
ity interrupt. A high-priority interrupt can’t be interrupted by any other interrupt source.
If two interrupt requests of different priority levels are received simultaneously, the request of
higher priority level is serviced. If interrupt requests of the same priority level are received simul-
taneously, an internal polling sequence determines which request is serviced. Thus within each
priority level there is a second priority structure determined by the polling sequence.
17.2
Interrupt Sources and Vector Addresses
Table 17-2.
Interrupt Sources and Vector Addresses
IPH.x
IPL.x
Interrupt Level Priority
0
0 (Lowest)
0
1
0
2
1
3 (Highest)
Number
Polling Priority
Interrupt Source
Interrupt
Request
Vector
Address
0
Reset
0000h
1
INT0
IE0
0003h
2
Timer 0
TF0
000Bh
3
INT1
IE1
0013h
4
Timer 1
IF1
001Bh
5
6
UART
RI+TI
0023h
6
7
Timer 2
TF2+EXF2
002Bh
7
5
PCA
CF + CCFn (n = 0 - 4)
0033h
8
Keyboard
KBDIT
003Bh
9
-
0043h
10
SPI
SPIIT
004Bh
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