參數(shù)資料
型號： T89C51RD2-RDVIM
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 0 to 40 MHz Flash Programmable 8-bit Microcontroller
中文描述： 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64
封裝： VQFP-64
文件頁數(shù)： 38/104頁
文件大小： 798K
代理商： T89C51RD2-RDVIM
38
T89C51RD2
4243G
–
8051
–
05/03
Interrupt System
The T89C51RD2 has a total of 7 interrupt vectors: two external interrupts (INT0 and
INT1), three timer interrupts (timers 0, 1 and 2), the serial port interrupt and the PCA glo-
bal interrupt. These interrupts are shown in Figure 16.
Figure 16.
Interrupt Control System
Each of the interrupt sources can be individually enabled or disabled by setting or clear-
ing a bit in the Interrupt Enable register (See Table 23.). This register also contains a
global disable bit, which must be cleared to disable all interrupts at once.
Each interrupt source can also be individually programmed to one out of four priority lev-
els by setting or clearing a bit in the Interrupt Priority register (See Table 24.) and in the
Interrupt Priority High register (See Table 22). shows the bit values and priority levels
associated with each combination.
Table 22.
Priority Level Bit Values
IE1
0
3
High priority
interrupt
Interrupt
polling
sequence, decreasing from
high to low priority
Low priority
interrupt
Global Disable
Individual Enable
EXF2
TF2
TI
RI
TF0
INT0
INT1
TF1
IPH, IP
IE0
0
3
0
3
0
3
0
3
0
3
0
3
PCA IT
IPH.x
IP.x
Interrupt Level Priority
0
0
0 (Lowest)
0
1
1
1
0
2
1
1
3 (Highest)
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